list of files formats

Archive and compressed
Main article: List of archive formats
.?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
BIK (.bik) — Bink Video file. A video compression system developed by RAD Game Tools
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 email 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)
VIV - Archive format used to compress data for several video games, including Need For Speed: High Stakes.
VOL - unknown archive
VSA — Altiris Virtual Software Archive
Z — Unix compress file
zoo
zip


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.
MDS - DAEMON tools native disc image file format used for making images from optical CD-ROM, DVD-ROM, HD DVD or Blu-ray Disc. It comes together with MDF file and can be mounted with DAEMON Tools or Alcohol 120% software.
MDX - New DAEMON Tools file format that allows to get one MDX disc image file instead of two (MDF and MDS).
DMG - Macintosh disk image files
(MPEG-1 is found in a .DAT file on a video CD.


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
DRW - Caddie Early version of Caddie drawing - Prior to Caddie changing to DWG
DWG — AutoCAD and Open Design Alliance applications
DFT — Solidedge Draft
DGN — MicroStation design file
DGK — Delcam Geometry
DMT — Delcam Machining Triangles
DXF — ASCII Drawing Interchange file format - AutoCAD
DWB — VariCAD drawing file
DWF — AutoDesk's Web Design Format; AutoCAD & Revit can publish to this format; similar in concept to PDF files; AutoDesk Design Review is the reader
EMB - Wilcom - Wilcom ES Designer Embroidery CAD file
ESW - Agtek format
EXCELLON, or Excellon file
FM — FeatureCAM Part File
FMZ — FormZ Project file
G — BRL-CAD Geometry File
GERBER, or Gerber file
GRB — T-FLEX CAD File
GTC - GRAITEC Advance file format
IAM — Autodesk Inventor Assembly file
ICD — IronCAD 2D CAD file
IDW — Autodesk Inventor Drawing file
IFC - buildingSMART for sharing AEC and FM data
IGES— Initial Graphics Exchange Specification
Intergraph's Intergraph Standard File Formats
IPN — Autodesk Inventor Presentation file
IPT — Autodesk Inventor Part file
model - CATIA V4 part document
PAR — Solidedge Part
PRT — NX (recently known as Unigraphics), Pro/ENGINEER Part, CADKEY Part
PLN — ArchiCad project
PSM — Solidedge Sheet
PSMODEL — PowerSHAPE Model
PWI — PowerINSPECT File
PYT — Pythagoras File
SKP- SketchUp Model
RLF — ArtCAM Relief
RVT — AutoDesk Revit project files
RFA — AutoDesk Revit family files
SLDASM — SolidWorks Assembly drawing
SLDDRW — SolidWorks 2D drawing
SLDPRT — SolidWorks 3D part model
Softimage's dotXSI
STEP — Standard for the Exchange of Product model data
STL Stereo Lithographic data format (see STL (file format)) used by various CAD systems and stereo lithographic printing machines.
TCT - TurboCAD drawing template
TCW - TurboCAD for Windows 2D and 3D drawing
VC6 — Ashlar-Vellum Graphite - 2D and 3D drafting
VLM — Ashlar-Vellum Vellum, Vellum 2D, Vellum Draft, Vellum 3D, DrawingBoard
VS — Ashlar-Vellum Vellum Solids
WRL Similar to STL, but includes color. Used by various CAD systems and 3D printing rapid prototyping machines. Also used for VRML models on the web.
XE — Ashlar-Vellum Xenon - for Associative 3D Modeling

Electronic design automation (EDA)
Electronic design automation (EDA), or electronic computer-aided design (ECAD), is specific to the field of electrical engineering.

GDSII
.brd — EAGLE Layout Editor Board File -- Eagle is Commercial EDA software for designing PCBs (printed circuit boards).
OASIS — Open Artwork System Interchange Standard
OpenAccess
SPICE netlist format (see SPICE, netlist)
VHD — A VHDL source file.
Intel HEX
MS10 — NI Multisim file