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File extensions are used by Windows, Macintosh, and now sometimes GNU/Linux operating systems to determine how each file should be used. This is a list of some such file extensions.
List
#
| Extension |
Description |
Used By |
Operating System(s)
|
| !BT |
Incomplete BitTorrent download file[1] |
BitTorrent |
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| !QB |
Incomplete qBittorrent download file[2] |
qBittorrent |
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| !UT |
Incomplete uTorrent download file[3] |
uTorrent |
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A
| Extension |
Description |
Used By |
Operating System(s)
|
| ABW |
Document |
AbiWord |
|
| AES |
Encrypted file (Advanced Encryption Standard) |
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| AVI |
Multimedia file |
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B
| Extension |
Description |
Used By |
Operating System(s)
|
| BAT |
Windows Command-line batch job file |
Command Prompt |
Windows
|
| BMP |
Bitmap image file |
|
|
C
| Extension |
Description |
Used By |
Operating System(s)
|
| CAB |
Cabinet file - file archive used for multiple purposes |
|
Windows and Windows Mobile (readable on Mac and GNU/Linux)
|
| CFG |
Program configuration file |
|
Windows & GNU/Linux
|
| CMD |
Windows Command-line batch job file |
Command Prompt |
Windows
|
| CPP |
C++ source code file |
Visual Studio, Eclipse, and other compilers |
|
| CSS |
Cascading Style Sheet for websites or datasheet/file for minority program(s) |
Web browsers |
All major systems
|
D
| Extension |
Description |
Used By |
Operating System(s)
|
| DAT |
Data file for an OS or program, not for direct user access |
|
Windows
|
| DOC |
Document file |
Microsoft Word, Open Office, AbiWord, etc. |
|
| DOCX |
Document file in the form of compressed XML |
Microsoft Word |
|
E
| Extension |
Description |
Used By |
Operating System(s)
|
| EPUB |
Open XML-based e-book |
|
|
| EXE |
Executable file (Binary) |
|
Windows
|
F
| Extension |
Description |
Used By |
Operating System(s)
|
| FLV |
Flash Video |
Adobe Flash Player |
|
| FMT |
Format File |
WinRAR and FoxPro
|
G
| Extension |
Description |
Used By |
Operating System(s)
|
| GIF |
Graphics Interchange Format image file |
|
|
| GMO |
GNU machine object file |
|
GNU/Linux
|
H
| Extension |
Description |
Used By |
Operating System(s)
|
| H |
Header source code file for C, C++ or Objective-C[4] |
Microsoft Visual Studio, text editors, Eclipse IDE for C Developers, etc |
Windows, Mac, GNU/Linux
|
| HTML |
Hypertext Markup Language |
Web browsers |
All major systems
|
I
| Extension |
Description |
Used By |
Operating System(s)
|
| ICO |
Icon file (image) |
|
|
| INI |
Initialization file |
|
|
| ISO |
File archive, generally used to store optical disk "images" |
|
|
J
| Extension |
Description |
Used By |
Operating System(s)
|
| JAR |
Java archive file used by the Java Runtime Environment (JRE) |
Java |
|
| JAVA |
Java source code file |
Java |
|
| JPE |
Joint Photographic Experts Group compression standard image file |
|
|
| JPEG |
Joint Photographic Experts Group compression standard image file |
|
|
| JPG |
Joint Photographic Experts Group compression standard image file |
|
|
K
| Extension |
Description |
Used By |
Operating System(s)
|
| KDZ |
Virus definition file |
Kaspersky |
|
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|
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L
| Extension |
Description |
Used By |
Operating System(s)
|
| LNK |
Shortcut to local file for web address |
|
|
| LOG |
Program or system log file |
|
|
| LTX |
LaTeX Source Document |
|
|
M
| Extension |
Description |
Used By |
Operating System(s)
|
| MD5 |
MD5 checksum file |
|
|
| MKV |
Video container file |
VLC media player, etc. |
|
| MOBI |
E-book file |
|
|
| MP3 |
MPEG audio stream (layer 3) file |
|
|
N
| Extension |
Description |
Used By |
Operating System(s)
|
|
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O
| Extension |
Description |
Used By |
Operating System(s)
|
| ODF |
Open Document Format |
Open Office & LibreOffice |
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P
| Extension |
Description |
Used By |
Operating System(s)
|
| PAGES |
Document |
|
|
| PDB |
Database or E-book file |
|
Windows, Palm OS, most e-readers
|
| PDF |
Portable Document Format |
Adobe Reader, Adobe Acrobat |
Windows, Mac OS
|
| PHP |
Hypertext Preprocessor code |
Most web browsers |
Major systems
|
| PNG |
Portable Network Graphics image |
|
|
| PRC |
Executable file (Palm OS) or 3D models and assemblies file (Adobe) |
|
|
| PTT |
Presentation file |
Microsoft Powerpoint, OpenOffice, WPS Office, etc. |
|
| PTTX |
Presentation file |
Microsoft Powerpoint, WPS Office, etc. |
|
| PUB |
Publication file |
Microsoft Publisher |
|
Q
| Extension |
Description |
Used By |
Operating System(s)
|
| QVM |
Q Virtual Machine |
|
|
R
| Extension |
Description |
Used By |
Operating System(s)
|
| RAR |
Compressed archive file |
WinRAR, 7-Zip, PeaZip, etc |
Wincows, Mac, GNU/Linux, Android
|
| RTF |
Rich Text file |
WordPad, Microsoft Word, Open Office, etc |
|
| RUN |
Executable file |
|
Mac OS
|
S
| Extension |
Description |
Used By |
Operating System(s)
|
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| SYS |
System file |
|
Windows
|
T
| Extension |
Description |
Used By |
Operating System(s)
|
| TAR |
Consolidated Unix file archive |
|
GNU/Linux
|
| TEX |
LaTeX source document |
|
|
| TXT |
Plain text file |
|
|
U
| Extension |
Description |
Used By |
Operating System(s)
|
| UFO |
Graphics file |
|
|
| URL |
Web address shortcut |
|
|
V
| Extension |
Description |
Used By |
Operating System(s)
|
| VBS |
Visual Basic Script |
|
Windows
|
| VOB |
Video Object |
Optical media disks |
|
W
| Extension |
Description |
Used By |
Operating System(s)
|
| WAV |
Audio file (Microsoft Windows RIFF WAVE) |
Windows Media Player, VLC, etc. |
All major systems
|
| WMV |
Windows Media video file |
Windows media Player, VLC, etc. |
All major systems
|
| WPD |
WordPerfect Document, a proprietary Corel format |
|
|
X
| Extension |
Description |
Used By |
Operating System(s)
|
| XCF |
Image file |
GIMP |
|
| XLS |
Spreadsheet file |
Microsoft Excel, Open Office, LibreOffice, etc |
|
| XLSM |
Open XML Macro-Enabled Spreadsheet[5] |
Microsoft Excel |
|
| XLSX |
Spreadsheet file (Compressed XML) |
Microsoft Excel, WPS Office, etc |
|
| XML |
Extensible Markup Language - data transfer file |
|
|
| XPS |
Page Layout File (similar to PDF, replaced EMF)[6] |
|
Windows, Mac, GNU/Linux
|
Y
| Extension |
Description |
Used By |
Operating System(s)
|
| YC |
Archive file |
|
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|
Z
| Extension |
Description |
Used By |
Operating System(s)
|
| ZABW |
Gzip compressed XML document |
AbiWord |
|
| ZIP |
Compressed (Zipped) folder |
7-Zip, WinZip, Pea Zip, etc. |
Mac & Windows
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