Software testing

Software testing is the process used to help identify the correctness completeness security and quality of developed computer software. Testing is a process of technical investigation performed on behalf of stakeholders that is intended to reveal quality-related information about the product with respect to the context in which it is intended to operate. This includes but is not limited to, the process of executing a program or application with the intent of finding errors. Quality is not an absolute it is value to some person. With that in mind testing can never completely establish the correctness of arbitrary computer software testing furnishes a criticism or comparison that compares the state and behaviour of the product against a specification. An important point is that software testing should be distinguished from the separate discipline of software quality assurance which encompasses all business process areas, not just testing.

There are many approaches to software testing, but effective testing of complex products is essentially a process of investigation, not merely a matter of creating and following routine procedure. One definition of testing is "the process of questioning a product in order to evaluate it", where the "questions" are operations the tester attempts to execute with the product, and the product answers with its behavior in reaction to the probing of the tester[citation needed]. Although most of the intellectual processes of testing are nearly identical to that of review or inspection, the word testing is connoted to mean the dynamic analysis of the product—putting the product through its paces. Some of the common quality attributes include capability, reliability efficiency portability maintainability, compatibility and usability. A good test is sometimes described as one which reveals an error; however more recent thinking suggests that a good test is one which reveals information of interest to someone who matters within the project community.

Another common practice is for test suites to be developed during technical support escalation procedures. Such tests are then maintained in regression testing suites to ensure that future updates to the software don't repeat any of the known mistakes.

It is commonly believed that the earlier a defect is found the cheaper it is to fix it.

	Time Detected
Time Introduced	Requirements	Architecture	Construction	System Test	Post-Release
Requirements	1	3	5-10	10	10-100
Architecture	-	1	10	15	25-100
Construction	-	-	1	10	10-25

[edit] White-box and black-box testing

White box and black box testing are terms used to describe the point of view a test engineer takes when designing test cases. Black box being an external view of the test object and white box being an internal view. Software testing is partly intuitive, but largely systematic. Good testing involves much more than just running the program a few times to see whether it works. Thorough analysis of the program under test, backed by a broad knowledge of testing techniques and tools are prerequisites to systematic testing. Software Testing is the process of executing software in a controlled manner; in order to answer the question “ Does this software behave as specified?” Software testing is used in association with Verification and Validation. Verification is the checking of or testing of items, including software, for conformance and consistency with an associated specification. Software testing is just one kind of verification

Test levels

• Unit testing tests the minimal software component and sub-component or modules by the programmer.
• Integration testing exposes defects in the interfaces and interaction between integrated components(modules).
• Functional testing tests the product according to programmable work.
• System testing tests an integrated system to verify/validate that it meets its requirements.
• Acceptance testing testing can be conducted by the client. It allows the end-user or customer or client to decide whether or not to accept the product. Acceptance testing may be performed after the testing and before the implementation phase. See also Development stage
• Alpha testing is simulated or actual operational testing by potential users/customers or an independent test team at the developers' site. Alpha testing is often employed for off-the-shelf software as a form of internal acceptance testing, before the software goes to beta testing.
• Beta testing comes after alpha testing. Versions of the software, known as beta versions, are released to a limited audience outside of the company. The software is released to groups of people so that further testing can ensure the product has few faults or bugs. Sometimes, beta versions are made available to the open public to increase the feedback field to a maximal number of future users.

It should be noted that although both Alpha and Beta are referred to as testing it is in fact use emersion. The rigors that are applied are often unsystematic and many of the basic tenants of testing process are not used. The Alpha and Beta period provides insight into environmental and utilization conditions that can impact the software.

After modifying software, either for a change in functionality or to fix defects, a regression test re-runs previously passing tests on the modified software to ensure that the modifications haven't unintentionally caused a regression of previous functionality. Regression testing can be performed at any or all of the above test levels. These regression tests are often automated.

Tools:

CAST tools are software applications used in the process of software testing. The acronym stands for "Computer Aided Software Testing". Such tools are available from various vendors and there are different tools for different types of testing, as well as for test management.

eCATT (extended Computer Aided Test Tool) is a tool for software test automation developed by SAP.eCATT offers a graphical user interface with ABAP script editor and its own command syntax. The capability for recording and for parameterizing the test components is also present.eCATT is used by Compuware's latest TestPartner version 5.4.0.

Red Hat Test Suite (RHTS) is a tool for testing open source software systems. An open source version exists, called Table Cloth.

Testware:

Generally speaking, Testware a sub-set of software with a special purpose, i.e. for software testing, especially for software testing automation.

Testware is produced by both verification and validation testing methods. Like software, Testware includes codes and binaries as well as test cases, test plan, test report and etc. Testware should be placed under the control of a configuration management system, saved, faithfully maintained.

But compared with general software, testware is special because:

• 1. Different purpose
• 2. Different metrics for quality
• 3. Different users

The different methods should be adpoted when you develope testware with what you use to develope general software.

Testware is also referred as test tools in a narrow sense.

Segue Software Incorporated (NASDAQ: SEGU) is a leader in quality optimization solutions through their automated software testing products like SilkTest. Segue was founded in 1988. The company has 200 employees worldwide and over $30 million in annual revenue. Segue is based in Lexington, Massachusetts. As of April 20, 2006, Segue has been acquired by Borland.

Tools developed by Segue include:

• SilkTest - functional/regression testing
• SilkPerformer - performance/load/stress testing
• SilkCentral Test Manager for test management

Selenium can refer to:

• Selenium, a chemical element
• Selenium (software), a test tool for web applications

One Simple effect in photoshop

1. Create new file with desired size, 72 PPI and white background.

Keep black as foreground color.

2. Type the text.

3. We have used above image as 'Day' picture

4. We have used above image as 'Night' picture

5. Drag the night image on the file

6. Layer > Group with Previous (ctrl+G)

7. The Layer Palette will look like this. Name the layer 'Night'

8. Drag the day image on the file. Name the layer 'Day'

9. The Layer Palette will look like this

10. Drag the day below the night layer

11. Select night layer. Select eraser tool. Choose soft round brush (we used 65)

12. Erase the upper half of the night layer

13. Layer > Layer Style > Bevel & Emboss (outer bevel) + Drop Shadow

File Extensions

$ TOP

$$A PR: OS/2

$$F Database file PR: OS/2

$$P notes PR: OS/2

$$S Spreadsheet file PR: PMSPREAD OS/2

$D$ Planner file PR: OS/2

$DB temporary File PR: DBASE IV

$ED temporary Editor file PR: MS C

$VM temporary File from Virtual Managers PR: MS WINDOWS

0 TOP

075 75x75 dpi screen characters PR: VENTURA PUBLISHER

085 85x85 dpi screen characters PR: VENTURA PUBLISHER

091 91x91 dpi screen characters PR: VENTURA PUBLISHER

096 96x96 dpi screen characters PR: VENTURA PUBLISHER

0B Printer Font LineDraw enhanced characters PR: PAGEMAKER

1 TOP

15U Printer Font PR: PAGEMAKER

1ST ASCII Text, Program Information ST: README.1ST

2 TOP

286 Driver Standard Mode PR: MS WINDOWS

2GR Screen Grabber EGA/VGA Mode PR: MS WINDOWS

3 TOP

301 FAX Data file PR: SUPER FAX 2000

386 Driver 386 Enhanced Mode PR: MS WINDOWS

3DS Graphic PR: 3D STUDIO

3FX 3-D Effect PR: COREL CHART

3GR Screen Grabber SVGA/XVGA Mode PR: MS WINDOWS

4 TOP

4SW Swap File PR: 4DOS

4TH FORTH Program File PR: FORTH CMP

8 TOP

8 A86 Assembler Program File

8M Printer Font Math 8 enhanced characters PR: PAGEMAKER

8U Printer Font Roman 8 enhanced characters PR: PAGEMAKER

A TOP

A ADA Program File

A Library PR: UNIX

A_T PR: A-TRAIN

A11 Graphic

AB6 Data file PR: AB STAT

AB8 Data file PR: AB STAT

ABC Flowchart PR: ABC FLOWCHARTER 1.x

ABK Automatic Backup PR: COREL DRAW

ABS Information (Abstracts)

ACM Driver (Audio Compression Manager)

ACT ACTOR Program File

ACT FoxDoc Action Diagram PR: FOXPRO

AD Screen Saver file PR: AFTER DARK

ADA ADA Program File

ADB Ada Package Body

ADD Device driver (Adapter Device Driver)

ADF Admin Config file

ADI Plotter file PR: AUTOCAD

ADL MCA Adapter Description Library PR: QEMM

ADM Screen Saver Module PR: AFTER DARK

ADN Add-in PR: LOTUS 1-2-3

ADR Random Screen Saver Module PR: AFTER DARK

ADS Ada Package Specification

ADX Index file PR: APPROACH

AF2 Flowchart PR: ABC FLOWCHARTER 2.0

AF3 Flowchart PR: ABC FLOWCHARTER 3.0

AFL Font PR: LOTUS 1-2-3

AFM Font (Outline Font Metric)

AFP Symbol Palette PR: ABC FLOWCHARTER

AFT Template PR: ABC FLOWCHARTER

AFW Work area PR: ABC FLOWCHARTER

AI Vector graphic PR: ADOBE ILLUSTRATOR

AIF Setup Information PR: ADW KNOWLEDGE WARE

AIO APL File Transfer Format

AIS Graphic (Array of Intensity Samples)

ALL Printer information PR: WORDPERFECT FOR WINDOWS

ALL Symbols and characters PR: ARTS & LETTERS

ALT Menu file PR: WORDPERFECT

ANI Animation

ANM Animation PR: DELUXE PAINT

ANN Help Annotation PR: MS WINDOWS

ANS Text and Layout PR: MS WORD FOR WINDOWS

ANT PR: SIM ANT

APC Printer driver characters PR: LOTUS 1-2-3

APD Printer driver PR: LOTUS 1-2-3

APF Printer driver fonts PR: LOTUS 1-2-3

API Printer driver information PR: LOTUS 1-2-3

APP Add-In Application file PR: SYMPHONY

APP Application (application) PR: DR-DOS / NEXT STEP

APP Relational Application PR: FOXPRO

ARC Archive File PR: MS SCHEDULE

ARC Compressed Archive File PR: ARC

ARJ Compressed Archive File PR: ARJ

ART Raster graphic (Atari)

ASC ASCII Text file

ASD Automatic Backup PR: MS WORD FOR WINDOWS

ASD screen driver PR: LOTUS 1-2-3

ASF Screen font PR: LOTUS 1-2-3

ASF Data file PR: STATGRAPHICS

ASH Assembler Header file PR: TURBO ASSEMBLER

ASI Assembler Include file PR: Turbo C / BORLAND C++

ASM Assembler Program File

ASO Assembler Object PR: TURBO ASSEMBLER

ASP ASPECT Program File PR: PROCOMM PLUS

BK2 Backup PR: WORDPERFECT FOR WINDOWS

BK3 Backup PR: WORDPERFECT FOR WINDOWS

BK4 Backup PR: WORDPERFECT FOR WINDOWS

BK5 Backup PR: WORDPERFECT FOR WINDOWS

BK6 Backup PR: WORDPERFECT FOR WINDOWS

BK7 Backup PR: WORDPERFECT FOR WINDOWS

BK8 Backup PR: WORDPERFECT FOR WINDOWS

BK9 Backup PR: WORDPERFECT FOR WINDOWS

BKI Backup index PR: IBM BOOKMANAGER

BKP Backup PR: WRITE

BKS Backup main (Bookshelf) PR: IBM BOOKMANAGER

BLD BASIC File in BLOAD Format

BLK temporary File PR: WORDPERFECT FOR WINDOWS

BM Graphic (BitMap)

BMK Bookmark for Help file (Bookmarks) PR: MS WINDOWS

BMP BitMaP Graphic PR: MS WINDOWS (PC Paintbrush)

BNK Adlib instrument bank

BOO Book PR: IBM BOOKMANAGER

BOO Compressed Archive File PR: BOO

BPT Bitmap Master File PR: COREL DRAW

BTM Batch To Memory Batch file PR: 4DOS

BTN Button File (ButtonWare)

BUP Backup

BV1 \backup file PR: WORDPERFECT FOR WINDOWS

BV2 \backup file PR: WORDPERFECT FOR WINDOWS

BV3 \backup file PR: WORDPERFECT FOR WINDOWS

BV4 \backup file PR: WORDPERFECT FOR WINDOWS

BV5 \backup file PR: WORDPERFECT FOR WINDOWS

BV6 \backup file PR: WORDPERFECT FOR WINDOWS

BV7 \backup file PR: WORDPERFECT FOR WINDOWS

BV8 \backup file PR: WORDPERFECT FOR WINDOWS

BV9 \backup file PR: WORDPERFECT FOR WINDOWS

C TOP

C C Program File

C00 Print file PR: VENTURA PUBLISHER

C86 C86 C Program File

CA7 Job file PR: BETA 44

CAL Calendar file PR: MS WINDOWS

CAL Spreadsheet file PR: SUPERCALC

CAP Caption PR: VENTURA PUBLISHER

CAP Session capture file PR: TELIX

CAT Catalog PR: DBASE IV

CBL COBOL Program File

CBT Computer Based Training

CC C++ Program File

CCH Chart PR: COREL CHART

CDB Database PR: TURBO C UTILITIES

CDR Vector graphic PR: COREL DRAW

CEL Graphic PR: AUTODESK ANIMATOR

CFG Configuration

CGA CGA screen characters PR: VENTURA PUBLISHER

CGM Vector graphic (Computer Graphics Metafile)

CH Header file PR: CLIPPER 5

CH3 Chart- File PR: HARVARD GRAPHICS

CHI Document PR: CHIWRITER

CHK Temporary File PR: WORDPERFECT FOR WINDOWS

CNV Data CoNVersion file PR: MS WORD FOR WINDOWS; Also: Canvas file (thanks to Tim Brewer

for that reference)

CNV Temporary File PR: WORDPERFECT FOR WINDOWS

COB COBOL Program File

COD Data file PR: MS MULTIPLAN

COD Compiler Program Code PR: FORTRAN

COD Template Source File PR: dBASE

COL Color palette - COLor palette PR: AUTODESK ANIMATOR

COL Spreadsheet file PR: MS MULTIPLAN

COM Program

CON Consolidation file PR: ADW Knowledge Ware

CPI Code Page Information

CPI Graphic (ColorLab Processed Image)

CPL Applet: Control PaneL PR: MS WINDOWS

CPP C++ Program File

CPS ST: CHKLIST.CPS Checksum for Anti-Virus PR: PCTOOLS

CPX Applet: Control PaneL PR: MS WINDOWS

CRD Index Card File PR: MS WINDOWS

CRF Cross-ReFerence PR: MS MASM / Zortech C++

CRP Database PR: DBASE IV

CSQ Queries PR: FOXPRO

CSV Comma Separated Values: Text file (ASCII)

CTF Character code Translation File PR: SYMPHONY

CTL Setup Information

CTX Compressed text

CUF C Utilities Form definition PR: TURBO C UTILITIES

CUR Cursor PR: MS WINDOWS

CUT Bitmap Graphic PR: DR. HALO

CV4 Colors PR: CODEVIEW

CVT Backup ConVerTed Database PR: DBASE IV

CVW Colors PR: CODEVIEW

CXX C++ Program File PR: ZORTECH C++

D TOP

DAT Data, usually in ASCII ST: REG.DAT (Registration) PR: MS WINDOWS / REGEDIT

DB Database PR: PARADOX

DD Compressed Archive File Macintosh PR: DISKDOUBLER

DDI DiskDupe Image PR: DISKDUPE

DDP Device driver Profile file (Device Driver Profile) PR: OS/2

DEF Definitions (Defaults)

DEL ST: CONTROL.DEL - list of data

DEM Demonstration

DEV Device driver

DFD File Flow Diagram Graphic PR: PROSA

DFM File Flow Diagram model PR: PROSA

DFV Print format Template PR: WORD

DHP Graphic (PIC Format) PR: DR. HALO

DIB Device-Independent Bitmap Graphic PR: MS WINDOWS

DIC Dictionary file

DIF Database PR: VISICALC

DIF Text file ( File Interchange Format)

DIR Dialing directory PR: PROCOMM PLUS

DIS Thesaurus PR: COREL DRAW

DIZ Program description

DL Animations file

DLD PR: LOTUS 1-2-3

DLG Dialog Resource Script PR: MS WINDOWS & SDK

DLL Dynamic Link Library PR: MS WINDOWS / OS/2

DMO Demo

DMP Dump file

DMS Compressed Archive File Amiga

DOC Document, Text file

DOS Text file and DOS Specification Info

DOT Document Template PR: MS WORD FOR WINDOWS

DOT Lines-Definition PR: COREL DRAW

DOX Text file PR: MULTIMATE 4.0

DPR default project PR: BORLAND C++

DRS Display Resource PR: WORDPERFECT FOR WINDOWS

DRV Device driver

DRW Vector graphic PR: MICROGRAFIX DESIGNER

DSK Project Desktop PR: BORLAND C++

DSP GraphicScreen Driver PR: DR. HALO

DSR Driver PR: WORDPERFECT FOR WINDOWS

DTA Data file PR: TURBO PASCAL / PC-FILE

DTF Database PR: Q&A

DVC PR: LOTUS 1-2-3

DVI DeVice Independent document PR: TeX

DVP DESQview Program Information file PR: DESQVIEW

DVP Device parameter file PR: AUTOCAD

DWC Compressed Archive File

DWG Drawing Database PR: AUTOCAD

DXF Drawing Interchange File Format Vector graphic PR: AUTOCAD

DYN PR: LOTUS 1-2-3

E TOP

EEB button bar for Equation Editor PR: WORDPERFECT FOR WINDOWS

EFT High resolution screen characters PR: CHIWRITER

EGA EGA screen characters PR: VENTURA PUBLISHER

ELT Event LisT Text file PR: PROSA

EMS Enhanced Menu System - Configuration PR: PC TOOLS

EMU Emulation PR: IRMA WORKSTATION FOR WINDOWS

ENC Encyclopedia PR: ADW KNOWLEDGE WARE

END Arrow Definition PR: COREL DRAW

ENG Dictionary file engine PR: SPRINT

ENV Environment PR: WORDPERFECT FOR WINDOWS

EPS Printer Font PR: VENTURA PUBLISHER

EPS Encapsulated PostScript Vector graphic PR: ADOBE ILLUSTRATOR

EQN Equation file PR: WORDPERFECT FOR WINDOWS

ERD Entity Relationship Diagram graphic file PR: PROSA

ERM Entity Relationship Diagram model file PR: PROSA

ERR Error Log file

ESH Extended Shell Batch file

EVT EVenT File Scheduler PR: PC TOOLS

EX3 Device driver PR: HARVARD GRAPHICS 3.0

EXC Exclude file from Optimization PR: QEMM

EXC REXX Program File (VM/CMS)

EXE Program

EXT Extension file PR: NORTON COMMANDER

F TOP

F FORTRAN Program File

F Compressed Archive File PR: FREEZE

F77 FORTRAN 77 Program File

FAC Usenix FACE Graphic

FAQ Frequently Asked Questions Text file

FAX Fax Graphic file PR: WINFAX PRO

FC Dictionary file PR: HARVARD GRAPHICS 2.0

FCT Catalog PR: FOXPRO

FD Declarations file PR: MS FORTRAN

FD Field Offsets Compiler PR: DATAFLEX

FEX FocExec PR: FOCUS

FFT DCA/FFT Final Form Text Text file PR: DISPLAYWRITE

FI Interface file PR: MS FORTRAN

FIF Fractal Image Format

FIL Files list Object file PR: dBASE

FIL Overlay PR: WORDPERFECT

FIN Print format Text file PR: PERFECT WRITER / MINCE

FIT FITS Graphic

FKY Macro file PR: FOXPRO

FLB Format library PR: PAPYRUS

FLD Folder PR: CHARISMA

FLI Animation PR: AUTODESK ANIMATOR

FLL Library PR: FOXPRO FOR WINDOWS

FLM Film PR: AUTOCAD

FLT Graphicfilter PR: diverse

FLX Ordered Binder file PR: DATAFLEX

FM1 Spreadsheet file PR: LOTUS 1-2-3 2.x

FM3 Device driver PR: HARVARD GRAPHICS 3.0

FM3 Spreadsheet file PR: LOTUS 1-2-3 3.x

FMB File Manager Button bar PR: WORDPERFECT FOR WINDOWS

FMO Ordered Format file PR: DBASE IV

FMT Format file PR: CLIPPER 5 / dBASE IV / FOXPRO

FMT Style sheet PR: SPRINT

GR2 screen driver PR: MS WINDOWS

GR3 Windows 3.0 screen Grabber

GRA PR: MS FLIGHT SIMULATOR

GRB MS-DOS Shell Monitor

GRF Graph PR: CHARISMA / GRAPH PLUS

GRP Program Manager Group PR: MS WINDOWS

GZ Compressed Archive File PR: GZIP

H TOP

H Header file

HA Compressed Archive File PR: HA

HBK Handbook PR: MATHCAD

HDL Alternate download file listing PR: PROCOMM PLUS

HDR Message Header PR: PROCOMM PLUS

HDR PC-File+ Database Header

HDX Help index

HEX Hex dump

HFI HP Font Info PR: GEM

HGL Graphic (HP Graphics Language)

HH C++ Header

HHH Precompiled Header PR: Power C

HHP Help data PR: PROCOMM PLUS

HLP Help data

HMM Alternate Mail Read option menu PR: PROCOMM PLUS

HOF Hall Of Fame (distinct scores)

HPF HP LaserJet Fonts PR: PAGEMAKER

HPG Vector graphic (HPGL Plotter file)

HPI Fonts information PR: GEM

HPJ Help ProJect PR: MS HELP COMPILER

HPK Compressed Archive File PR: HPACK

HPM Alternate Main menu for privileged users PR: PROCOMM PLUS

HPP C++ Header PR: ZORTECH C++

HQX Compressed Archive File Macintosh ASCII PR: BINHEX

HRM Alternate Main menu for limited/normal users PR: PROCOMM PLUS

HST History PR: PROCOMM PLUS

HTM Hypertext Markup Language (HTML)

HTX Hypertext file

HXM Alternate Protocol Selection menu for all users PR: PROCOMM PLUS

HXX C++ Header

HYC PR: WORDPERFECT

HYD Hyphenation Dictionary file PR: WORDPERFECT FOR WINDOWS

HYP Compressed Archive File PR: HYPER

I TOP

ICL Icon Library PR: PC TOOLS

ICN Icon Program File

ICO Icon PR: MS WINDOWS

ID Disk Identification File

IDF Instruments drivers file

IDX Index

IFF Graphic, Sound (Interchangeable File Format)

IFS ST: HPF.IFS - System file PR: OS/2

IGS IGES-Format

IM8 Sun Raster Graphic

IMG Bitmap Graphic PR: GEM / VENTURA PUBLISHER

IN3 Input Device driver PR: HARVARD GRAPHICS 3.0

INC Include file (diverse Programmer's Language)

IND index PR: DBASE IV

INF Help file (OS/2 Buch)

INF Information Text file (ASCII)

INF Setup file

INI Initialization file

INK Pantone Reference file PR: COREL DRAW

INS PR: WORDPERFECT

INT Borland Interface Units

INT Code page file, collation sequence PR: FOXPRO

INX Index PR: FOXBASE

IO Compressed Archive File PR: CPIO

ION Text program/installation descriptION file ST: DESCRIPT.ION PR: 4DOS & others

IPL Pantone Spot reference palette PR: COREL DRAW

IRS ST: STANDARD.IRS PR: WORDPERFECT

ISD Dictionary file PR: RapidFile

ISH Compressed Archive File PR: ISH

IW Iconware Application PR: ICON AUTHOR

IWA Text file PR: IBM Writing Assistant

IWP Text file (Wang)

J TOP

JAS Graphic

JOB Job file PR: BETA 44

JOR Journal file SQL

JPG Graphic JPEG (Joint Photography Experts Group)

JW Text file PR: JUSTWRITE

JWL Text file Library PR: JUSTWRITE

JZZ Spreadsheet file PR: JAZZ

K TOP

KBD Keyboard layout PR: IRMA WORKSTATION FOR WINDOWS

KBM Keyboard layout

KEX KEDIT Profile file

KEY Keyboard macros

KYB Keyboard layout

L TOP

L LEX Program File

L Link instructions

L LISP Program File

LAB Mailing Labels PR: Q+E For MS EXCEL

LAY Word chart layout PR: APPLAUSE

LBG Label generator PR: DBASE IV

LBL label PR: dBASE IV / dBFAST / CLIPPER 5

LBM Bitmap graphic PR: DELUXE PAINT

LBO Ordered Labels PR: DBASE IV

LBR screen driver PR: LOTUS 1-2-3

LBR Compressed Archive File PR: LU

LBT Label Memo PR: FOXPRO

LBX Label PR: FOXPRO

LCF Linker Control File PR: NORTON GUIDES

LCN Dictionary file PR: WORDPERFECT

LD Long Distance codes PR: TELIX

LD1 Overlay file PR: dBASE

LDB Database file PR: MS Access

LES Learn program (LESson)

LEX Lexicon (Dictionary file)

LFT LaserPrinter Font PR: CHIWRITER

LGO MS Windows Logo Driver PR: MS WINDOWS

LHW Compressed Archive File Amiga PR: LHWARP

LIB Program Library (diverse Programmer's Language)

LIF Compressed Archive File

LIF Logical Interchange Format Data file (Hewlett-Packard)

LIN Line Art PR: AUTOCAD

LJ Text file for HP LJ II Printer

LNK Linker file

LOG Log file

LRF Linker Response File PR: MS C/C++

LRS Language Resource File PR: WORDPERFECT FOR WINDOWS

LSP LISP Program File PR: XLISP

LST List file

LST ST: PACKING.LST List of files on Installation disks PR: MS-DOS and others

LZH Compressed Archive File PR: LHA / LHARC

LZS Compressed Archive File PR: LARC

LZW Compressed Archive File Amiga PR: LHWARP

M TOP

M Function PR: MATLAB

M Macro Sourcecode PR: BRIEF

M PR: MATHEMATICA

M3 ModuleA 3 Program File

M3D 3D AnimationsMacro

MA3 Macro PR: HARVARD GRAPHICS 3.0

MAC Bitmap Graphic PR: MACPAINT

MAC Macro

MAK Make file

MAK Project file PR: VISUAL BASIC

MAN Manual

MAP Colorpalette

MAP Format Data PR: MICROGRAFX PICTURE PUBLISHER

MAP Linker Map file

MAS Master data definition PR: FOCUS

MAT PR: MATLAB

MAX MAX Program File

MB Memo Holder for Database PR: PARADOX

MBK Multiple index Backup PR: DBASE IV

MCC Configuration PR: MATHCAD

MCD Document PR: MATHCAD

MCF Font PR: MATHCAD

MCI MCI Command Set

MCP Printer driver PR: MATHCAD

MCW Text file PR: WORD For MACINTOSH

MD Compressed Archive File PR: MDCD

MDB Database PR: MS ACCESS

MDM Modem definition PR: TELIX

MDX Multiple Index PR: DBASE IV

ME Standard: READ.ME - ASCII Text file

MEB Macro Editor bottom overflow file PR: WORDPERFECT

MED Macro Editor delete save PR: WORDPERFECT

MEM Macro Editor macro PR: WORDPERFECT

MEM Memory file of Variables (Memory) PR: dBASE IV / FOXPRO

MEQ Macro Editor print queue PR: WORDPERFECT

MER Macro Editor resident area PR: WORDPERFECT

MES Macro Editor work space PR: WORDPERFECT

MET Macro Editor top overflow file PR: WORDPERFECT

MET Meta file

MEU Menus (DOS Shell)

MEX MEX file (executable command) PR: MATLAB

MF MetaFont Text file

MGF Font PR: MICROGRAFX

MID MIDI- File PR: MS WINDOWS

MIF MIDI Instrument

MIX Object file PR: POWER C

MMM Animation

MND Menu Program File PR: AUTOCAD

MNT Menu memo PR: FOXPRO

MNU Menu PR: AUTOCAD / NORTON COMMANDER

MNX compiled menu file PR: AUTOCAD

MNX Menu PR: FOXPRO

MOB Device definitions PR: PEN WINDOWS

MOD Audio file (Amiga)

MOD ModuleA-2 Program File

MOD Windows Kernel Module

MOV Movie

MP PR: Multiplan

MPC Calender PR: MS PROJECT

MPD Mini port driver

MPG MPEG Animation

MPM MathPlan Macro PR: WORDPERFECT

MPP Project file PR: MS PROJECT

MPR Program PR: FOXPRO

MPV View PR: MS PROJECT

MPX Compiler Menu PR: FOXPRO

MRB Multiple Resolution Bitmap Graphic PR: MS C/C++

MSP Bitmap Graphic PR: MS WINDOWS 2.x PAINT

MST Minispecification PR: PROSA

MST Setup script PR: MS WINDOWS SDK

MSW Text file PR: MS WORD

MTH Math PR: DERIVE

MTW Data file PR: MINITAB

MU Menu PR: QUATTRO PRO

MUS Audio file

MVB Database PR: MS INFO VIEWER

MVF Stop frame file PR: AUTOCAD AUTOFLIX

MVI Movie command file PR: AUTOCAD AUTOFLIX

MXT PR: MS C

N TOP

NB Text file PR: NOTA BENE

NCD Norton Change Directory PR: NORTON COMMANDER

NDX Index PR: dBASE / dBFAST

NET Network Configuration PR: HARVARD GRAPHICS FOR WINDOWS / PARADOX

NEW New info

NG Online-Documentation PR: NORTON GUIDE

NLS National language support - Code Page

NOT Notes PR: IBM BOOKMANAGER

NST Amima MOD Audio file

NTF Notes PR: IBM BOOKMANAGER

NTS Tutorial PR: NORTON

NTX Index PR: CLIPPER 5

NWS Info Text file (latest news) (ASCII)

O TOP

O Object file PR: UNIX

O$$ Outfile PR: SPRINT

OBJ object code

OCX OLE Control Extension

OFF Vector graphic (Object File Format)

OFM Font (Adobe)

OLB Object Library

OLD Backup

OLI Text file (Olivetti)

OPC Job file PR: BETA 44

OPT Optimize PR: QEMM

OPX Organization diagram PR: MS ORGCHART

OUT Output file

OV1 Program file - Overlay

OV2 Program file - Overlay

OV3 Program file - Overlay

OVL Program file - Overlay

OVR Program file - Overlay

P TOP

P PASCAL Program File

P Picture PR: APPLAUSE

PAD Keypad definition PR: TELEMATE

PAK Compressed Archive File PR: PAK

PAL Color palette

PAR Parameter file PR: FRACTINT

PAS PASCAL Program File

PAT Hatch-Pattern PR: AUTOCAD

PAT Vector-Pattern PR: COREL DRAW

PBI Profiler Binary Input PR: MS SOURCE PROFILER

PBM PBM Portable Bit Map Graphic

PBO Profiler Binary Output PR: MS SOURCE PROFILER

PBT Profiler Binary Table PR: MS SOURCE PROFILER

PC Text file IBM PC-specific Info

PC3 Custom palette PR: HARVARD GRAPHICS 3.0

PC8 ASCII Text IBM-8

PCD Graphic (Photo-CD Image)

PCF Profiler Command File PR: MS SOURCE PROFILER

PCH Patch File

PCH PreCompiled Header PR: MS C/C++

PCK pick file PR: TURBO PASCAL

PCL HP-PCL Graphic Data file (HP Printer Control Language)

PCT Bitmap Graphic

PCW Text file PR: PC WRITE

PCX Bitmap Graphic PR: PAINTBRUSH

PDB PR: TACT

PDI PR: MS POWERPOINT

PDR Printer driver

PDR Port driver

PDS PDS Graphic

PDV Printer driver PR: PAINTBRUSH

PEB Program Editor bottom overflow file PR: WORDPERFECT

PED Program Editor delete save PR: WORDPERFECT

PEM Program Editor macro PR: WORDPERFECT

PEQ Program Editor print queue file PR: WORDPERFECT

PER Program Editor resident area PR: WORDPERFECT

PES Program Editor work space file PR: WORDPERFECT

PET Program Editor top overflow file PR: WORDPERFECT

PF Profile file (Monitor, Printer )

PFA Outline Font

PFB Outline Font

PFK Programmable function keys PR: XTREE PRO

PFM Printer outline Font Metric: Font (Adobe Type 1 PostScript)

PFT Printer Font PR: CHIWRITER

PGM PBM Portable Gray Map Graphic

PGP PR: PRETTY GOOD PRIVACY

PH PERL Header

PH Phrase-table PR: MS C/C++, MS HELP COMPILER

PIC Bitmap Graphic

PIF Program Information File PR: MS WINDOWS

PIT Compressed Archive File Macintosh PR: PACKIT

PJT Project memo PR: FOXPRO

PJX Project PR: FOXPRO

PKA Compressed Archive File PR: PKARC

PL Palette PR: HARVARD GRAPHICS FOR WINDOWS

PL PERL Program File

PL3 Chart Palette PR: HARVARD GRAPHICS 3.0

PLB Library PR: FOXPRO

PLC Add-In PR: LOTUS 1-2-3

PLN Spreadsheet file PR: WORDPERFECT FOR WINDOWS

PLT HPGL Plotter file Vector graphic PR: AUTOCAD

PM PM Graphic

PM3 Document PR: PAGEMAKER 3

PM4 Document PR: PAGEMAKER 4

PM5 Document PR: PAGEMAKER 5

PN3 Printer driver PR: HARVARD GRAPHICS 3.0

PNM PBM Portable aNy Map Graphic

PNT Macintosh painting

POP Popup Menu PR: dBASE

PP Compressed Archive File Amiga PR: POWERPACKER

PPD PostScript Printer Description

PPL PolaroidPalettePlus ColorKey Device driver PR: HARVARD GRAPHICS 3.0

PPM PBM Portable Pixel Map Graphic

PPO Preprocessor output PR: CLIPPER 5

PPT PowerPoint-Foils PR: POWERPOINT

PR2 Printer driver PR: DBASE IV

PR2 Presentation PR: ALDUS PERSUASION 2.0

PR3 PostScript Printer driver PR: DBASE IV

PRD Printer driver PR: Diverse

PRE Settings (preferences) PR: MS C/C++

PRF Printer driver PR: DBASE IV

PRF Profiler output

PRG Program File PR: CLIPPER 5 / dBASE IV / dBFAST / FOXPRO

PRJ Project

PRM Parameter PR: Diverse

PRN Text file PR: LOTUS 1-2-3 / SYMPHONY

PRO PROLOG Program File

PRS Printer ReSource file for fonts PR: WORDPERFECT FOR WINDOWS

PRS procedure PR: DBASE IV

PRS ST: PLSAMP.RS PR: HARVARD GRAPHICS

PRT Printer Configuration PR: IRMA WORKSTATION FOR WINDOWS

PRT Printer driver PR: DR. HALO

PRX Compiler Program PR: FOXPRO

PS PostScript (ASCII)

PSF PostScript Printer Font PR: CHIWRITER

PSM Symbol table PR: TURBO PASCAL

PT3 Device driver PR: HARVARD GRAPHICS 3.0

PT3 Template PR: PAGEMAKER 3

PT4 Template PR: PAGEMAKER 4

PT5 Template PR: PAGEMAKER 5

PUB Public Key Ring PR: PRETTY GOOD PRIVACY

PUB Publication PR: VENTURA PUBLISHER

PW Text file PR: PROFESSIONAL WRITE

PWL Password List

PX Primer Database index PR: PARADOX

PY PYTHON script

PYC Compiler PYTHON Script

PZD PR: PIZAZZ PLUS

PZO PR: PIZAZZ PLUS

Q TOP

QAG Quick Access Group PR: NORTON DESKTOP

QBD Keyboard layout PR: IRMA WORKSTATION FOR WINDOWS

QBE Example Query (Query By Example) PR: dBASE IV / QUATTRO PRO

QBO Ordered Query PR: DBASE IV

QEF Query PR: Q+E For MS EXCEL

QEP PR: IRMA WORKSTATION FOR WINDOWS

QLB Quick Library PR: MS C/C++

QLC ST: ATMFONTS.QLC (PostScript Help file)

QPR Relational Query PR: FOXPRO

QPR driver for Printer queue PR: OS/2

QPX Ordered Query PR: FOXPRO

QRS Equation Editor PR: WORDPERFECT FOR WINDOWS

QRT QRT ray tracing Graphic

QRY Query (query) PR: DBASE IV

R TOP

R8 raw Graphic

RAS Sun Raster graphic

RAW RAW RGB 24-bit Graphic

RBF Data file PR: RBASE

RC Resource Compiler Script file PR: BORLAND C++ / MS C++

RDX Data file PR: REFLEX

REC Record file PR: SPRINT

REC Recorded macro PR: MS WINDOWS

REF Cross reference

REG Registration data PR: MS WINDOWS / REGEDIT

REM Annotation

REQ REQuest

RES dBASE Resources PR: DBASE IV

RES Compiler Resources PR: BORLAND C++ / MS C++

REX REXX Program File

REZ Resources

RF Sun raster Graphic

RFT Text file (DCA/RFT Revisable Format Text) PR: IBM DISPLAYWRITE

RI PR: LOTUS 1-2-3

RLB ST: HGW.RLB PR: HARVARD GRAPHICS FOR WINDOWS

RLE Graphic (Run Length Encoded)

RMI MIDI- File

RMK Makefile PR: RMAKE

RND Rendering Slide PR: AUTOCADE AUTOSHADE

ROL Adlib Music (Roland)

RPD Database PR: RAPIDFILE

RPT Report

RR PR: RAILROAD TYCOON

RSL Resources Library PR: PC TOOLS

RSP ReSPonce (Text file and Eingaben)

RTF Rich Text Format Text file

RTF Windows Help file script

RTL Text file

RUN Script Tools - Program PR: PC TOOLS

S TOP

S$$ Temporary Sort file PR: SPRINT

SAM Text file (Samna) PR: AMI PRO 2.x , 3.x

SAV Backup

SB Audio file

SBP DML Program PR: SUPERBASE 4

SC screen driver PR: FRAMEWORK II

SC3 screen driver PR: HARVARD GRAPHICS 3.0

SCC Text file

SCD Graphic (SCODL Scan Conversion Object Description Language)

SCH PR: MS SCHEDULE

SCN Compressed Screen format

SCO High Score (diverse Programs)

SCR Screen Snapshot (diverse Programs)

SCR Screen Saver PR: MS WINDOWS

SCR Fax PR: FAXVIEW

SCR Script

SCT screen PR: FOXPRO

SCT Script Tools - Program File PR: PC TOOLS

SCX screen PR: FOXPRO

SDF System File Format

SEA Compressed Archive File Macintosh

SEC Compressed Archive File

SEC Secret key ring PR: PRETTY GOOD PRIVACY

SEQ Animation (Atari)

SET Configuration (diverse Backups)

SF WPS attribute storage ST: WP_ROOT.SF PR: OS/2

SFI Printer Font (HP LaserJet landscape) PR: VENTURA PUBLISHER

SFL Printer Font (HP LaserJet landscape) PR: VENTURA PUBLISHER

SFP Printer Font (HP LaserJet portrait) PR: VENTURA PUBLISHER

SFT ScreenFont PR: CHIWRITER

SGI Graphic

SH Archive File PR: SHAR

SH3 presentation PR: HARVARD GRAPHICS 3.0

SHB Background file PR: COREL SHOW

SHG Hypergraphic PR: HOTSPOT EDITOR

SHK Compressed Archive File Apple II PR: SHRINKIT

SHM Shell Macro PR: WORDPERFECT

SHR Archive File PR: SHAR

SHW Presentation / Show file PR: HARVARD GRAPHICS 2.0 / COREL SHOW

SIK Backup File

SIM Simulation PR: MS FLIGHT SIMULATOR

SIT Compressed Archive File Macintosh PR: STUFFIT

SL S-Lang Program File

SLB Slide library PR: AUTOCAD

SLC Compiler SALT Script PR: TELIX

SLD Slide PR: AUTOCAD

SLK SYLK (Symbolic Link) PR: MULTIPLAN

SLT SALT Script Application Language for Telix script source PR: TELIX

SM SMALLTALK Program File

SM Text file PR: SAMNA WORD

SMM Macro PR: AMI PRO 2.x, 3.x

SMP Sample

SND Sound file

SNG Song (MIDI)

SNO SNOBOL Program File

SP Compressed Archive File PR: SPLINT

SPC Program PR: MS PULTIPLAN

SPC Temporary File PR: WORDPERFECT FOR WINDOWS

SPD Bitstream Typefaces Font PR: HARVARD GRAPHICS 3.0

SPD Postscript printer mini driver

SPG Glossary PR: SPRINT

SPL Printer -Spool file PR: MS WINDOWS

SPL Printer driver PR: SPRINT

SPL Compressed Archive File PR: SPLINT

SPL SamPLe

SPM ST: WP.SPM PR: WORDPERFECT

SPP Printer file PR: SPRINT

SPR Document letter PR: SPRINT

SPR Generated screen program PR: FOXPRO

SPS screen driver PR: SPRINT

SPT SPITBOL Program File

SPX Compiler screen Program PR: FOXPRO

SQL SQL Data

SQZ Compressed Archive File PR: SQUEEZE

SRC Sourcecode (Source) PR: DATAFLEX and others

SRF Graphic (Sun Raster File)

ST SMALLTALK Program File

STD State Transition Diagram Graphic PR: PROSA

STF Compressed Archive File PR: SHRINKTOFIT

STF Setup Information

STM State Transition Diagram Model PR: PROSA

STR Structure list PR: dBASE

STS Project status info PR: MS C/C++

STY Template n (Style library/sheet)

SUN Graphic (Sun rasterfile)

SUP supplementary Dictionary file PR: WORDPERFECT FOR WINDOWS

SVD Backup file PR: MS WORD

SVG Backup file PR: MS WORD

SVS Backup file PR: MS WORD

SW Audio file (signed word)

SWP Backup file PR: SPRINT

SWP Swap file PR: DOS

SY3 Symbol file PR: HARVARD GRAPHICS 3.0

SYD Backup file PR: MS WINDOWS SYSEDIT.EXE

SYM Symbol file PR: HARVARD GRAPHICS / MS WINDOWS SDK

SYM Symbol table (diverse Compiler)

SYN Synonyms PR: MS WORD 5

SYS System file: Device driver, HardwareConfiguration

SYW Graphic (Symbol) PR: HARVARD GRAPHICS FOR WINDOWS

T TOP

TAG Query Tag Name PR: DATAFLEX

TAH Help file for Turbo Assembler PR: BORLAND C++

TAR Compressed Archive File PR: TAR

TB1 Font PR: BORLAND TURBO C

TB2 Font PR: BORLAND TURBO C

TBK Memo Backup PR: dBASE IV / FOXPRO

TBK Toolbook (Asymetrix ToolBook)

TC Configurations file PR: BORLAND C++ / TURBO C

TCH Help file PR: BORLAND C++ / TURBO C

TD Configurations file PR: TURBO DEBUGGER

TDB Database

TDF Outline Font

TDH Help file Turbo Debugger PR: BORLAND C++

TDK Keyboard record PR: TURBO DEBUGGER

TDS Symbol table PR: TURBO DEBUGGER

TEM Turbo Editor Macro Language PR: BORLAND C++

TEM Template (template) PR: ICON AUTHOR

TFS Statistik PR: TURBO PROFILER

TGA Truevision Targa Graphic

THB Graphic (Bitmap)

THM Database der Graphicen PR: MS CLIPART GALLERY

THS thesaurus Dictionary file PR: WORDPERFECT FOR WINDOWS

TIF Tagged Image File Format - Bitmap Graphic

TMF Tagged Font Metric file PR: WORDPERFECT FOR WINDOWS

TMO ZTG global optimizer default output file PR: ZORTECH C++

TMP temporary File

TMS Script PR: TELEMATE

TOC Table Of Contents Text file (ASCII)

TP Configurations file PR: TURBO PASCAL

TP3 Template PR: HARVARD GRAPHICS 3.0

TPH Help file PR: TURBO PASCAL

TPL Resident units PR: TURBO PASCAL

TPL Template PR: HARVARD GRAPHICS 2.0

TPP Protected Mode Units PR: TURBO PASCAL

TPU Turbo Pascal Unit (BGI) PR: TURBO PASCAL

TPW Turbo Pascal Unit (BGI) PR: TURBO PASCAL FOR WINDOWS

TRE Directory Tree PR: PC TOOLS

TRM Terminal settings PR: MS WINDOWS

TRN Translation PR: QUATTRO

TSP Windows Telephony Service Provider

TST Printer -Test file PR: WORDPERFECT FOR WINDOWS

TTF TrueType Font

TUT Tutorial

TX8 DOS-Text

TXT Text file

TYM Time Stamp program PR: PAGEMAKER 4 & 5

U TOP

UB Audio file (unsigned byte)

UI User Interface PR: SPRINT

UL uLAW Audio file

ULD Uploaded files PR: PROCOMM PLUS

UNX Text file - UNIX specific Info

UPD Update file PR: dBASE

UPO Compiled update file PR: dBASE

USP Printer Font US-ASCII enhanced characters PR: PAGEMAKER

USR User Database PR: PROCOMM PLUS / TURBO C++

UU Compressed Archive File ASCII PR: UUENCODE

UUE Compressed Archive File ASCII PR: UUENCODE

UW Audio file (unsigned word)

V TOP

VAL Value (values) PR: dBASE

VAR Variable PR: ICON AUTHOR

VBX Visual Basic eXtension PR: VISUAL BASIC

VC Spreadsheet file PR: VISICALC

VCX Spreadsheet file PR: VISICALC

VEW Viewfile PR: CLIPPER 5

VGA VGA screen driver PR: Diverse

VGA VGA screen characters PR: Diverse

VGR Graphic PR: VENTURA PUBLISHER

VID screen driver PR: WORD

VID Monitor control file PR: MS-DOS Shell

VMF font characteristics PR: VENTURA PUBLISHER

VOC Audio file

VSD Drawing PR:VISIO

VSS Stencil PR:VISIO

VST Truevision Vista Graphic

VST Template PR:VISIO

VUE View PR: dBASE IV / FOXPRO

VW Text file PR: VOLKSWRITER

VWR file viewer file PR: PC TOOLS

VXD Virtual Device driver

W TOP

W Word chart PR: APPLAUSE

W30 Printer Font (AST TurboLaser) PR: VENTURA PUBLISHER

W40 Backup file from MS Windows 95

WAV Waveform Audio file

WBF Windows Batch File

WBK Workbook PR: WORDPERFECT FOR WINDOWS

WCD Macro token list PR: WORDPERFECT FOR WINDOWS

WCM File transmission file PR: MS WORKS

WCM Macro PR: WORDPERFECT FOR WINDOWS

WDB Database PR: MS WORKS

WFN Graphics: Symbols and Fonts PR: COREL DRAW

WFX Data file PR: WINFAX

WID width table PR: VENTURA PUBLISHER

WIN Window PR: dBASE / FOXPRO

WK1 Spreadsheet file PR: LOTUS 1-2-3 2.x / SYMPHONY

WK3 Spreadsheet file PR: LOTUS 1-2-3 3.x

WKB Document PR: WORDPERFECT FOR WINDOWS

WKE Spreadsheet file PR: LOTUS 1-2-3 (Student version)

WKQ Spreadsheet file PR: QUATTRO PRO

WKS Spreadsheet file PR: Lotus 1-2-3 / SYMPHONY / MS Works

WKS Workspace PR: XLISP

WMC Macro PR: WORDPERFECT FOR WINDOWS

WMC Text file PR: WORDMARC

WMF Vector graphic (Windows MetaFile) PR: MS WINDOWS

WN Text file PR: WRITE NOW

WNF Outline Font PR: COREL DRAW

WOA Swap file PR: MS WINDOWS

WP Text file PR: WORDPERFECT 4.2

WP5 Text file PR: WORDPERFECT 5

WPD screen driver PR: WORDPERFECT

WPF Text file PR: WORDPERFECT

WPG WordPerfect Graphic Bitmap PR: DRAWPERFECT

WPK Macros PR: WORDPERFECT FOR WINDOWS

WPM Macros PR: WORDPERFECT

WPS Text document PR: MS WORKS

WQ! Compressed Spreadsheet file PR: QUATTRO PRO

WQ1 Spreadsheet file PR: QUATTRO PRO

WR1 Spreadsheet file PR: SYMPHONY

WRD Template PR: CHARISMA

WRI Text file PR: WINDOWS WRITE

WRK Spreadsheet file PR: SYMPHONY 1.0

WRP Compressed Archive File Amiga PR: WARP

WRS Windows Printer driver PR: WORDPERFECT FOR WINDOWS

WS Text file PR: WORDSTAR 5.0+6.0

WS2 Text file PR: WORDSTAR 2000

WSD Data file PR: WORDSTAR

WST Text file PR: WORDSTAR

X TOP

X LEX Program File

X01 Secondary index PR: PARADOX

X02 Secondary index PR: PARADOX

X03 Secondary index PR: PARADOX

X04 Secondary index PR: PARADOX

X05 Secondary index PR: PARADOX

X06 Secondary index PR: PARADOX

X07 Secondary index PR: PARADOX

X08 Secondary index PR: PARADOX

X09 Secondary index PR: PARADOX

XAB Address Book PR: XENIX MAIL

XBM Bitmap Graphic

XFN Printer Font PR: VENTURA PUBLISHER

XFT 24 Pin Printer Font PR: CHIWRITER

XLA Addin: Macro PR: MS EXCEL

XLB PR: MS EXCEL

XLC Chart Diagram PR: MS EXCEL

XLL Excel Dynamic Link Library PR: MS EXCEL

XLM MacroTemplate PR: MS EXCEL

XLS Spreadsheet file PR: MS EXCEL

XLT MasterTemplate PR: MS EXCEL

XLT Translation table PR: LOTUS 1-2-3 / SYMPHONY

XLW Workspace PR: MS EXCEL

XPM Graphic

XQT Macro sheet PR: SUPERCALC

XRF Cross reference

XY Text file PR: XY WRITE

XY3 Text file PR: XYWRITE III

XYW Text file PR: XYWRITE III

Y TOP

Y Compressed Archive File Amiga PR: YABBA

Y01 Secondary index PR: PARADOX

Y02 Secondary index PR: PARADOX

Y03 Secondary index PR: PARADOX

Y04 Secondary index PR: PARADOX

Y05 Secondary index PR: PARADOX

Y06 Secondary index PR: PARADOX

Y07 Secondary index PR: PARADOX

Y08 Secondary index PR: PARADOX

Y09 Secondary index PR: PARADOX

Z TOP

Z Compressed Archive File ASCII PR: COMPRESS

ZIP Compressed Archive File PR: PKZIP

ZOM Compressed Archive File Amiga PR: ZOOM

ZOO Compressed Archive File PR: ZOO

ZVD ZyXEL Voice file PR: Z-FAX