* .?Q? — files compressed by the SQ program.
* 7z — 7-Zip compressed file
* ace - ACE compressed file
* ALZ — Alzip compressed file
* AT3 - Sony's UMD Data compression
* .bke - BackupEarth.com Data compression
* ARC
* ARJ - ARJ compressed file
* BA - Scifer Archive (.ba), Scifer External Archive Type
* big Special file compression format used by Electronic Arts for compressing the data for many of EA's games
* BKF (.bkf) — Microsoft backup created by NTBACKUP.EXE
* bzip2 (.bz2)
* bmp (paint)
* c4 - JEDMICS image files, a DOD system
* cab — Microsoft Cabinet
* cals - JEDMICS image files, a DOD system
* cpt/sea — Compact Pro (Macintosh)
* DAA — Closed-format, Windows-only compressed disk image
* deb — Debian Linux install package
* DMG — an Apple compressed/encrypted format
* EEA — An encrypted CAB, ostensibly for protecting e-mail attachments
* .egg - Alzip Egg Edition compressed file
* EGT (.egt) EGT Universal Document also used to create compressed cabinet files replaces .ecab
* ECAB (.ECAB, .ezip) EGT Compressed Folder used in advanced systems to compress entire system folders, replaced by EGT Universal Document
* ESS (.ess) EGT SmartSense File, detects files compressed using the EGT compression system.
* GHO (.gho, .ghs) — Norton Ghost
* gzip (.gz) — Compressed file
* IPG (.ipg) Format in which Apple Inc. packages their iPod games. can be extracted through Winrar
* jar — ZIP file with manifest for use with Java applications.
* LBR — Library file
* LQR — LBR Library file compressed by the SQ program.
* LHA (.lzh) - Lempel, Ziv, Huffman
* lzo
* lzma
* lzx
* MPQ Archives (.mpq) - Used by Blizzard games
* MacBinary (.bin)
* PAK — Enhanced type of .ARC archive
* Parchive (.par, .par2)
* Quake 3 archive (.pk3) (See note on Doom³)
* Doom³ archive (.pk4) (Opens similarly to a zip archive.)
* RAR Rar Archive (.rar), for multiple file archive (rar to .r01-.r99 to s01 and so on)
* SEN Scifer Archive (.sen), Scifer Internal Archive Type
* sit/sitx — StuffIt (Macintosh)
* tar
* .tar.gz, .tgz (gzipped tar file)
* TB (.tb) — Tabbery Virtual Desktop Tab file
* TIB (.tib) — Acronis True Image backup
* uha (Ultra High Archive Compression)
* VOL - unknown archive
* VSA — Altiris Virtual Software Archive
* Z — Unix compress file
* zoo
* zip
[edit] Physical recordable media archiving
* ISO - The generic file format for most optical media, including CD-ROM, DVD-ROM, Blu-ray Disc, HD DVD and UMD.
-Iso images indicate write directives, while .bin files that usually accompany such files contain the actual data.
* NRG - The proprietary optical media archive format used by Nero applications.
* IMG - For archiving MS-DOS formatted floppy disks.
* ADF - Amiga Disk Format, for archiving Amiga floppy disks
* ADZ - The GZip-compressed version of ADF.
* DMS - Disk Masher System, a disk-archiving system native to the Amiga.
* DSK - For archiving floppy disks from a number of other platforms, including the ZX Spectrum and Amstrad CPC.
* D64 - An archive of a Commodore 64 floppy disk.
* SDI - System Deployment Image, used for archiving and providing "virtual disk" functionality.
* MDF - Alcohol 120% CD Image File (Alcohol Software) - One of several CD image formats that Alcohol 120% can mount.
* DMG - Macintosh disk image files
(MPEG-1 is found in a .DAT file on a video CD.
[edit] Computer-aided
Computer-aided is a prefix for several categories of tools (ie. design, manufacture, engineering) which assist professionals in their respective fields (ie. machining, architecture, schematics).
[edit] Computer-aided design (CAD)
Computer-aided design (CAD) software assists engineers, architects and other design professionals in project design.
* 3dmlw - 3DMLW (3D Markup Language for Web) files
* 3dxml - Dassault Systemes graphic representation
* ACP — VA Software VA - Virtual Architecture CAD file
* AR — Ashlar-Vellum Argon - 3D Modeling
* ART — ArtCAM model
* ASC — BRL-CAD Geometry File (old ascii format)
* ASM — Solidedge Assembly, Pro/ENGINEER Assembly
* BIN, BIM — Data Design System DDS-CAD
* CCC — CopyCAD Curves
* CCM — CopyCAD Model
* CCS — CopyCAD Session
* CAD — CadStd
* CATDrawing - CATIA V5 Drawing document
* CATPart - CATIA V5 Part document
* CATProduct - CATIA V5 Assembly document
* CATProcess - CATIA V5 Manufacturing document
* cgr - CATIA V5 graphic representation file
* CO — Ashlar-Vellum Cobalt - parametric drafting and 3D modeling
* CV6 — Ashlar-Vellum Graphite - 2D and 3D drafting
* DRW - Caddie Early version of Caddie drawing - Prior to Caddie changing to DWG
* DWG — AutoCA