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File extension filetypes
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Website  EXT   Filetype description                                    
    FILExt  $$$  Used by OS/2 to keep track of archived files 
    File Extensions  @@@  Screen files used in the installation and instruction by e.g. Microsoft Codeview for C 
    File Extensions  ~NT  NT Install Files (Used between first & second reboot
    FILExt  000  (000-999) Used to number backup versions of files or used to number related data files for multiple users of a small-scale PC application 
    FILExt  AAS  Movie Clip Autodesk Animation Setup used by Compton's Reference Collection 
    DotWhat  ADD  Adapter driver file used in the boot process 
    File Extensions  ADD  OS/2 adapter drivers used in the boots process 
    Wikipedia  ALE  Avid Log Exchange (used in film & video editing) - Avid 
    Wikipedia  APL  Support module used by Manugraphics APL products 
    File Extensions  ATY  3D Topicscape file used for a round-trip re-import 
    FILExt  AUD  Audio File Used by Westwood Studios for Various Games 
    File Extensions  BBM  Deluxe Paint bitmap image used for animations 
    FILExt  BIN  MacBinary Archive Format Often used on Macintosh
    File Extensions  BIN64  Binary encoding method (used by mime complient mail readers
    File Extensions  BK$  sometimes used for backup versions 
    DotWhat  BTM  Batch file used by Norton Utilities 
    File Extensions  BTM  batch file used by Norton Utilities 
    FILExt  CCL  PDP-10 Concise Command Language (Used by COMPIL.EXE to Talk to Compilers
    FILExt  CDKEY  Protocol Used in Communicating from MediaRemote Server to PC MediaRemote Plug-in 
    FILExt  CNF  Configuration File Used by Telnet Windows and other applications with varying internal formats
    Wikipedia  CNV  Winword DLL used as part of an import operation (CNV=converter) - Microsoft Word 
    Wikipedia  DBS  Data file used by Managing Your Money 
    Wikipedia  DCT  Dictionary: used by many programs with program dependent format - Clarion 
    File Extensions  DDA  Import file format used with TNTmips 
    Wikipedia  DIB  Device Independent Bitmap - rarely used Windows 3.0 bitmap - Win - OS/2 
    Wikipedia  DOC  A Document, or an ASCII text file with text formatting codes in with the text. This generic extension is used by many word processors. - Microsoft Word and others 
    DotWhat  DPKG  Proprietary file used to program AAC devices 
    Wikipedia  ETF  Encrypted Text File. Used in some security programs
    FILExt  EXE  Out-of-process Code Component Used by COM Clients (Microsoft Corporation
    File Extensions  GEOM  AVS (Application Visualization System) Used by the AVS commercial high-end visualization environment
    DotWhat  GLF  3D font used by glf 
    Wikipedia  GRDNT  Image format used in the core of some very obscure customized operating systems to represent gradients - see also SCTOR 
    FILExt  H__  C++ Header Seldom used C++ Header (same as H++ and H) 
    File Extensions  H__  seldom used C++ Header same as H++ and H 
    FILExt  HM  Windows Help Context IDs used by MAKEHM.EXE. 
    DotWhat  HM  Windows Help context IDs used by MAKEHM.EXE 
    File Extensions  HM  Windows Help context IDs used by MAKEHM.EXE 
    File Extensions  HPJ  Ms Help Compiler Help ProJect file used to combine .hm and .rtf files to a compiled .hlp file 
    File Extensions  IDB  Database used by disassembler program 
    FILExt  IDB  Database Used by Disassembler 
    File Extensions  IDE  gen. file used to store settings for an IDE compiler 
    FILExt  INT  Intermediate Code Used for Syntax Checking 
    File Extensions  INT  Intermediate Code used for syntax checking 
    File Extensions  INTELLIFONT  Intellifonts (outline typefaces used in hp laserjet
    Wikipedia  IPC  Intellitec Program Configuration - used to configure vehicle electronics - Intellitec 
    File Extensions  LAY  Generally used for layout file 
    File Extensions  LGD  Windows application log used for optimizations 
    File Extensions  LGE  Windows application log used for optimizations 
    FILExt  LIB  Library Used by an Application 
    Wikipedia  LIC  License file used by some programs to put their license on disk 
    FILExt  MAP  Debug Info Used by Some Programming Languages 
    Wikipedia  MAR  Mozilla ARchive - Mozilla Updater (used to house binary updates to products
    Wikipedia  MIS  Mission, used by many games 
    FILExt  MTX  Temporary File often used by a Browser or TWAIN Device 
    File Extensions  MUZ  MIDI (used by Windows' Hover game
    File Extensions  MVA  Archive Used by MS some setup programs 
    Wikipedia  NDS  Nintendo DS ROM file used for Homebrew and commercial (Game) files on DS 
    File Extensions  NEZ  Emulator file used for game consoles (NES) 
    DotWhat  NEZ  Emulator file used for game consoles 
    File Extensions  NSZ  Benchmark data file used by nVidia nTune tool 
    DotWhat  ODA  Used with OCX 
    FILExt  ODA  Used with OCX 
    File Extensions  ODA  Used with OCX 
    File Extensions  OEM  OEM data used during device install files 
    FILExt  OEM  OEM Data Used During Device Install 
    Wikipedia  OPT  Options - name used by many programs for configuration information 
    DotWhat  PBL  Library file used in a development environment 
    FILExt  PM  Pegasus Mail Frequently Used File (David Harris
    File Extensions  PM  Pegasus Mail frequently used file 
    DotWhat  PRL  seldom used for .pl = perl source file 
    File Extensions  PRL  seldom used for .pl = perl source file 
    File Extensions  PRO  abbrev. for project used by many prgs 
    Wikipedia  PRO  Profile - used by many programs to store configuration data 
    File Extensions  QLB  QB-DOS quick library used with Microsoft QB.EXE QBX.EXE VBDOS.EXE QuickC 1.0 
    Wikipedia  REP  Report file used by many applications 
    Wikipedia  RPB  Data report file used by CP Backup - CP Backup 
    Wikipedia  RPT  Report file used by many applications 
    Wikipedia  RSL  Resource Library used by PC Tools for Windows - PC Tools - Win 
    FILExt  RUF  ProWORX Nxt Address Used Tables Reference (Schneider Electric
    File Extensions  RUF  ProWORX Nxt address used tables reference 
    Wikipedia  RUNZ  pseudo-executable file, used in Portable Apps and software installers for Super OS - RUNZ Framework 
    Wikipedia  SCTOR  Raster graphics format used by some very obscure custom operating systems
    Wikipedia  SET  Extension used by Norton Backup and CPS Backup for setup info - Norton Backup - CPS Backup 
    Wikipedia  SKY  SYLK Spreadsheet file (used by Multiplan
    File Extensions  SLI  Slice : used by some 3d-modeller 
    File Extensions  SMT  extension used by some CAD programms used for SMT-circuit layout 
    Wikipedia  STY  Ami Pro Template (Style) - used by other programs for `styles` - Ami Pro 
    File Extensions  STY  gen. STYle template library or sheet used by many text and graphics programs 
    Wikipedia  TBL  Short for Table - used by many programs 
    File Extensions  TEX  TEXture used in Paint Shop Pro 
    File Extensions  TIG  Tiger file used by U.S. government to distribute maps 
    DotWhat  TNY  TiNY bitmap image used on Atari 
    Wikipedia  TRK  Track (i.e. video sequence), used by many games 
    File Extensions  TTXT  (Creator Code Mac) SimpleText 'ttxt' (all lower case. This was also used by TeachText
    Wikipedia  WAR  Java Web Archive - A Java file format used to package and deploy web applications
    File Extensions  WD  archive used in games Earth 2140-2160 
    Wikipedia  XA  XA audio file - used in SimCity 3000 by Maxis, also by Sony Playstation 
    Wikipedia  XAR  Xara file - Project document used by vector graphics editor Xara Xtreme, previously known as Xara Studio. Early versions used the extension 'ART'. 
    File Extensions  ZNM  Movie files (used in Lucas' Starwars pod race

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