List of filename extensions (F–L)

This alphabetical list of filename extensions contains extensions of notable file formats used by multiple notable applications or services.

Contents

• !$@
• 0-9
• A
• B
• C
• D
• E
• F
• G
• H
• I
• J
• K
• L
• M
• N
• O
• P
• Q
• R
• S
• T
• U
• V
• W
• X
• Y
• Z

• See also
• References

F

Ext.	Description	Used by
F	Forth language source code file	Forth development systems
F	Fortran language source code file (in fixed form)	Many Fortran compilers
F01	Fax	perfectfax
F03	Fortran language source code file (in free form)	Many Fortran compilers
F08	Fortran language source code file (in free form)	Fortran compilers
F18	Fortran language source code file (in free form)	Fortran compilers
F4	Fortran IV source code file	Fortran IV source code
F4V[1]	A container format for Flash Video that differs from the older FLV file format (see also SWF)	Adobe Flash
F77	Fortran language source code file (in fixed form)	Many Fortran compilers
F90	Fortran language source code file (in free form)	Many Fortran compilers
F95	Fortran language source code file (in free form)	Many Fortran compilers
FA[2][3][4]	FASTA format sequence file
FAA[2][3][4]	FASTA format amino acid
FACTOR	Factor source file
FASTA[2][3][4]	FASTA format sequence file
FASTQ[2][3][4]	FASTQ format sequence file
FB	Forth language block file	Forth development systems
FB2[5]	FictionBook e-book 2.0 file (DRM-free XML format)	e-book readers
FBX [6]	3D model geometry, material textures, lighting, armature, and animation sequences for inter application use/transport	Autodesk
FCHK	Gaussian-formatted checkpoint file. Used to store result of quantum chemistry calculation results.[7]
FCS	FCS molecular biology format.[8]
FEN[9]	Forsyth–Edwards Notation	Chess applications -text data describes a specific position.
FF	Farbfeld image
FFAPX	FrontFace plugin file	FrontFace digital signage software
FFN[3][4][2]	FASTA format nucleotide of gene regions
Fit	CurvFit Input file format	CurvFit software
FITS[10][11]	Flexible Image Transport System	astronomy software
FLAC[12]	Audio codec, Audio file format
FLAME	Fractal configuration file	Apophysis
FLP	FL Studio project file	FL Studio
FLV[13]	A container format for Flash Video (see also SWF)	Adobe Flash
FMU	A Functional Mockup Unit (FMU) implements the Functional Mockup Interface (FMI).[14]
FNA[2][3][4]	FASTA format nucleic acid
FNI	FileNet Native Document	FileNet
FNX	Saved notes with formatting in markup language	FeatherNote
FODG[15]	OpenDocument Flat XML Drawings and vector graphics	OpenDocument, LibreOffice, Collabora Online
FODP[15]	OpenDocument Flat XML Presentations	OpenDocument, LibreOffice, Collabora Online
FODS[15]	OpenDocument Flat XML Spreadsheets	OpenDocument, LibreOffice, Collabora Online
FODT[15]	OpenDocument Flat XML Text Document	OpenDocument, LibreOffice, Collabora Online
FOR	Fortran language source file	many
FQL[16]	Fauna Query Language source file	Fauna
Freq	Match-n-Freq (TM) Input file format	Match-n-Freq software
FRAG	Fragment File, usually stored on MOVPKG files	MOVPKG
FRM[17]	MySQL Database Metadata	MySQL
Frq7	Match-n-Freq (TM) version 7+ Input file format	Match-n-Freq software
FS	F# source file	F# compilers
FS	Forth language source code file (often used to distinguish from .fb)	Forth development systems
FTH	Forth language source code file	Forth development systems

G

Ext.	Description	Used by
G4[18]	ANTLR4 grammar	ANTLR4
G6	Graph6 graph data format. Used for storing undirected graphs.[19]
GB	GenBank molecular biology format.[20]
GBK	same as GB
GBR[21]	Gerber format	PCB CAD/CAM
GDF[22]	General Data Format for Biomedical Signals	Biomedical signal processing, Brain Computer Interfaces
GDSCRIPT	Godot (game engine) Script File	Godot (game engine)
GDT	Gerätedatentransfer, an xDT application	Healthcare providers in Germany
GED[23]	GEDCOM	Genealogy data exchange
GEOJSON	GeoJSON is specified by RFC 7946.[24]
GEOTIFF	Used for archiving and exchanging aerial photography or terrain data.[25]
GGB	GeoGebra File	GeoGebra
GIF[26]	Compuserves' Graphics Interchange Format (bitmapped graphics)	QPeg - Display - CompuShow
GM9[27]	Scripts for GodMode9	Godmode9
GMI	Gemtext markup language[28]	Gemini (Protocol)
GMK	GameMaker Project File	YoYo Games
GML[29]	Geography Markup Language File	Geography Markup Language
GML	Used for the storage and exchange of graphs. Native format of the Graphlet graph editor software.[30]
GO	Go source code file	Go (Programming language)
GODOT	Godot (game engine) Project File	Godot (game engine)
GPX[31][32]	GPS eXchange Format
GRAPHML	GraphML is an acronym derived from Graph Markup Language. Represents typed, attributed, directed, and undirected graphs.[33]
GRB	Commonly used in meteorology to store historical and forecast weather data. Represents numerical weather prediction output (NWP).[34]
GREXLI	Uncompressed folder as a file	WinGrex/GrexliLib
GRIB	same as GRB
GRP	Data pack files for the Build Engine	Duke Nukem 3D
GSF	Generic sensor format	Used for storing bathymetry data, such as that gathered by a multibeam echosounder.
GTF[35]	Gene transfer format
GV[36]	Graph Visualization	Graphviz
GW	same as .lgr. See LGR below for details on LEDA (.gw, .lgr).
GXL	GXL is an acronym derived from Graph Exchange Language. Represents typed, attributed, directed, and undirected graphs.[37]
GZ	gzip compressed data	gzip

H

Ext.	Description	Used by
H!	On-line help file	Flambeaux Help! Display Engine
H!	Pertext database	HELP.EXE
H--	C-- language header	Sphinx C--
H	Header file (usually C language)	Watcom C/C++
H++	Header file	C++
HA	Archive	HA
HACK	Source file for the programming language hack	The HHVM[38]
HAR[39]	HTTP Archive format (JSON-format web-browser log)	W3C draft standard
HDF	General-purpose format for representing multidimensional datasets. Developed by the US National Center for Supercomputing Applications (NCSA).[40]
HDF5	General-purpose format for representing multidimensional datasets and images. Incompatible with HDF Version 4 and earlier.[41]
HDI	Hard Disk Image file (PC-9800 disk image file)	PC-9800 emulators
HDMP	heap dumpfile
HEIC	HEIF raster image and compression format. Commonly used for storing still or animated images.[42]
HEIF	same as HEIC.
HH	C++ header file
HIN	HyperChem HIN format. Used in cheminformatics applications and on the web for storing and exchanging 3D molecule models. Maintained by HyperCube, Inc.[43]
HOF	Basic Configuration file	OMSI The Bus Simulator
HOI4	Hearts Of Iron 4 file	Hearts Of Iron 4 Save game
HPP	C++ header file	Zortech C++ - Watcom C/C++
HTA	HTML Application	Microsoft Windows
HTM	see HTML
HTML[44]	Hypertext Markup Language (WWW)	Netscape - Mosaic - many
HUM	3D Model database	OMSI The Bus Simulator
HXX	C++ header file

I

Ext.	Description	Used by
ICAL	same as ICS (see below).
ICC[45]	ICC profile	Color Configuration for color input or output devices
ICE	LHA Archive	Cracked LHA (old LHA), Total Commander
ICL	Icon library	Microsoft Windows
ICNS	Macintosh icons format. Raster image file format.[46]
ICO	Icon file	ICONEDIT.EXE; Microsoft Windows
ICS	ICS iCalendar format. Used for the storage and exchange of calendar information. Commonly used in personal information management systems.[47]
IFB	Same as ICS (see above).
IFC[48]	Industry Foundation Classes (platform neutral, open file format used by BIM software). It is registered by ISO and is an official International Standard ISO 16739-1:2018.	BIM software
IGC[49]	Flight tracks downloaded from GPS devices in the International Gliding Commission's prescribed format
IGES[50]	Initial Graphics Exchange Specification
IMG	Disk image
INFO	Texinfo hypertext document	Texinfo, info (Unix), Emacs
INI[51]	Configuration file
IO[52]	Archive	CPIO
IPT	XnView IPTC template	XnView, XnViewMP
IPTRACE	AIX iptrace captures[53] dualhome.iptrace (AIX iptrace) Shows Ethernet and Token Ring packets captured in the same file.[54]	WireShark
IRX	"IOP Relocatable eXecutable". Library files to dynamically link application code to the Input/Output Processor on the PS2 to communicate with devices like memory cards, USB devices, etc.	Sony PlayStation 2
ISO	ISO-9660 table	see: List of ISO image software
IT	Impulse Tracker music file	Impulse Tracker

J

Ext.	Description	Used by
JL	Julia script file	Julia (programming language)
J2C[55]	JPEG 2000 image	JPEG 2000
J2K	JPEG2000 raster image and compression format. Can store images as an array of rectangular tiles that are encoded separately.[56]
JAR[57]	Java archive	JAR, Java Games and Applications
JAV[58]	see JAVA
JAVA[58]	Java source code file
JBIG[59][60][61]	Joint Bilevel Image Group
JCM	same as JDX (see below).
JDX	Chemical spectroscopy format. JCAMP is an acronym derived from Joint Committee on Atomic and Molecular Physical Data.[62]
JNLP[63]	Java Network Launching Protocol	Java Web Start
JP2[55]	JPEG 2000 image
JPE[64]	Joint Photographic Experts Group graphics file format	Minolta/Konica Minolta cameras use this for JPEGs in Adobe RGB color space
JPEG[64]	Joint Photographic Experts Group graphics file format	QPeg - FullView - Display
JPG[64]	Joint Photographic Group	various (Minolta/Konica Minolta cameras use this for JPEGs in sRGB color space)
JS[65]	JavaScript file	script in HTML pages
JSON[66][67]	JSON (JavaScript Object Notation)	Ajax
JSP[68]	Jakarta Server Pages	Dynamic pages running Web servers using Java technology
JUMP	Beyond Jump save file	Cell to Singularity
JVX	JavaView 3D geometry format. The native format of the JavaView visualization software. Used for the visualization of 2D or 3D geometries. Can be embedded in web pages and viewed with the JavaView applet.[69]
JXL	JPEG XL raster graphics file

K

Ext.	Description	Used by
KEY	Keynote Presentation	Keynote
KLC[70]	MSKLC Source file	Microsoft Keyboard Layout Creator
KML[71][72]	Keyhole Markup Language	Google Earth
KMZ[71][72]	Keyhole Markup Language (Zip compressed)	Google Earth
KO	Linux kernel module format system file	Linux
KRA[73]	Krita image file	Krita
KRABER	Kraber source code file	Kraber Programming Language
KSH	Kornshell source file	Kornshell
KT	Kotlin source code file	Kotlin Programming Language
KV	Kivy

L

Ext.	Description	Used by
LABEL	Dymo label file	Dymo desktop software
LATEX	LaTeX typesetting system and programming language. Commonly used for typesetting mathematical and scientific publications.[74][75]
LBR	.LBR Archive	for CP/M and MS-DOS using the LU program
LDB	.LDB Leveldb data file	Google key-value storage library
LDB	.LDB MDB Database lock file	Microsoft Access Database
LDT	Labordatenträger, an xDT application	Healthcare providers in Germany
LGR	LEDA graph data format. Commonly used exchange format for graphs. Stores a single, typed, directed, or undirected graph. Native graph file format of the LEDA graph library and the GraphWin application. LEDA is an acronym for Library of Efficient Datatypes and Algorithms.[76]
LHA	LHA Archive	LHA/LHARC, Total Commander
LISP	LISP source code file
LL	LLVM Assembly Language	llvm
LM	Language Model File[77]	Microsoft Windows
LMD	FCS molecular biology format.[8]
LNK	Local file shortcut	Microsoft Windows
LOGICX	Logic Pro files	Logic Pro (MacOS, iPadOS)
LRC	Lyrics file	Lyrics for karaoke-related system and program
LUA	Lua script file	Lua (programming language)
LWO	Native format of the LightWave 3D rendering and animation software. LWO is an acronym for LightWave Object. Developed by NewTek. Stores 3D objects as a collection of polygons and their properties.[78]
LZ	Archive	Lzip

See also

• List of filename extensions
• List of file formats

Notes

References

1. "F4V/FLV Technology Center". Adobe. Retrieved 2020-09-15.
2. "Alignment Fileformats". 22 May 2019. Retrieved 22 May 2019.
3. Lipman DJ, Pearson WR (March 1985). "Rapid and sensitive protein similarity searches". Science. 227 (4693): 1435–41. Bibcode:1985Sci...227.1435L. doi:10.1126/science.2983426. PMID 2983426.
4. Pearson WR, Lipman DJ (April 1988). "Improved tools for biological sequence comparison". Proceedings of the National Academy of Sciences of the United States of America. 85 (8): 2444–8. Bibcode:1988PNAS...85.2444P. doi:10.1073/pnas.85.8.2444. PMC 280013. PMID 3162770.
5. "FictionBook 2.0 Specification". bribuser.ru. Retrieved 2020-09-13.
6. "Autodesk FBX Files | 3ds Max | Autodesk Knowledge Network". knowledge.autodesk.com. Retrieved 2018-07-28.
7. "FCHK (.fchk)".
8. "FCS (.fcs, .lmd)".
9. "Standard: Portable Game Notation Specification and Implementation Guide". Internet Archive. 12 March 1994. Retrieved 25 July 2020. The page linking to the document is here.
10. "Flexible Image Transport System: a new standard file format for long-term preservation projects?" (PDF). Vatican City. 2012-07-05. Archived from the original (PDF) on 2013-05-30. Retrieved 2013-03-06.
11. "IAU FITS Working Group". NASA.
12. Coalson, Josh. "FLAC - format". Retrieved 4 April 2013. "fLaC", the FLAC stream marker in ASCII, meaning byte 0 of the stream is 0x66, followed by 0x4C 0x61 0x43
13. "Video File Format Specification Version 10" (PDF). Adobe. November 2008. Retrieved 2020-09-15.
14. "FMU (.fmu)".
15. "Open Document Format for Office Applications (OpenDocument) Version 1.3. Part 3: OpenDocument Schema". OASIS Open. 2021-04-27. Retrieved 2021-09-12.
16. "Fauna Query Language". fauna.com. Retrieved 2022-01-26.
17. "MySQL .frm File Format". mysql.com. Retrieved 2020-09-13.
18. "Collection of Antlr4 grammars". GitHub.
19. "Graph6 (.g6)".
20. "GenBank (.gb, .gbk)".
21. "Gerber Format". ucamco.com. 2020-04-09. Retrieved 2020-09-13.
22. Schlögl, Alois (2006). "GDF - A general dataformat for biosignals". arXiv:cs/0608052v10.
23. "GEDCOM X Specifications". gedcomx.org. Retrieved 2020-09-14.
24. "GeoJSON (.geojson)".
25. "GeoTIFF (.tif, .tiff)".
26. "Graphics Interchange Format, Version 89a". W3C. 31 July 1990. Retrieved 6 March 2009.
27. Homebrew, Nintendo. "GodMode9 Usage". 3DS Hacks Guide. Retrieved 2023-11-10.
28. "Project Gemini". gemini.circumlunar.space. Retrieved 2021-11-24.
29. Open Geospatial Consortium Inc. (2010-02-08), Technical Committee Policies and Procedures: MIME Media Types for GML (PDF)
30. "Graphlet (.gml)".
31. "GPX: the GPS Exchange Format". topografix.com. Retrieved 2020-09-14.
32. "OpenGIS Geography Markup Language (GML) Encoding Standard". Retrieved 2011-03-25.
33. "GraphML (.graphml)".
34. "GRIB (.grb, .grib)".
35. "GTF2.2: A Gene Annotation Format". wustl.edu. Archived from the original on 2022-01-19. Retrieved 2020-09-14.
36. "Graphviz - Graph Visualization Software". graphviz.org. Retrieved 2020-10-20.
37. "GXL (.gxl)".
38. "HHVM 4.0.0". HHVM.
39. "HTTP Archive (HAR) format". W3C Web Performance Working Group. 2012-08-14. Retrieved 2019-05-18.
40. "HDF (.hdf)".
41. "HDF5 (.h5, .hdf5)".
42. "HEIF (.heic, .heif)".
43. "HIN (.hin)".
44. "HTML Standard". whatwg.org. Retrieved 2020-09-14.
45. "ICC Specifications". 2020. Retrieved 2020-09-14.
46. "ICNS (.icns)".
47. "ICS (.ics, .ical, .ifb)".
48. "Certified Software". 23 June 2022.
49. "IGC Flight Recorder Specification Edition 2 with AL5 2019-10-30". 3 August 2017. Archived from the original on 2019-05-08. Retrieved 2020-04-30.
50. Initial Graphics Exchange Specification IGES Version 1.0, Roger N. Nagel, Ph.D., Project Manager Walt W. Braithwaite, M.S., Boeing Philip R Kennicott, Ph.D., General Electric, National Bureau of Standards, NBSIR 80-1978, March 1980
51. Archiveddocs (22 February 2013). "Configure an Ini File Item". docs.microsoft.com. Retrieved 2020-12-18.
52. "Cpio". GNU.org.
53. "5.2. Open Capture Files".
54. "SampleCaptures".
55. JPEG. "Joint Photographic Experts Group, JPEG2000". Retrieved 2009-11-01.
56. "JPEG2000 (.jp2, .j2k)".
57. "JAR File Specification". Oracle Corporation. Retrieved 2020-09-14.
58. Gosling, James; Joy, Bill; Steele, Guy; Bracha, Gilad. "The Java Language Specification, 2nd Edition". Archived from the original on August 5, 2011. Retrieved February 8, 2008.
59. ISO/IEC JTC 1/SC 29 (2009-05-07). "ISO/IEC JTC 1/SC 29/WG 1 - Coding of Still Pictures (SC 29/WG 1 Structure)". Archived from the original on 2013-12-31. Retrieved 2009-11-11.{{cite web}}: CS1 maint: numeric names: authors list (link)
60. ISO/IEC JTC 1/SC 29. "Programme of Work, (Allocated to SC 29/WG 1)". Archived from the original on 2013-12-31. Retrieved 2009-11-07.{{cite web}}: CS1 maint: numeric names: authors list (link)
61. ISO. "JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information". Retrieved 2009-11-11.
62. "JCAMP-DX (.jdx, .dx, .jcm)".
63. "JSR 56: Java Network Launching Protocol and API". Retrieved 2020-09-14.
64. "T.81 – DIGITAL COMPRESSION AND CODING OF CONTINUOUS-TONE STILL IMAGES – REQUIREMENTS AND GUIDELINES" (PDF). CCITT. September 1992. Retrieved 12 July 2019.
65. "ECMAScript 2020 Language Specification".
66. "Standard ECMA-404 - The JSON Data Interchange Syntax" (PDF). Ecma International. December 2017. p. 1, footnote. Retrieved 27 October 2019.
67. "ISO/IEC 21778:2017". ISO. Retrieved 29 July 2019.
68. "JSR 245: JavaServer Pages 2.1". jcp.org. 2013-06-12. Retrieved 2020-09-14.
69. "JVX (.jvx)".
70. "MSKLC Guide". MSKLC Guide. 26 April 2023. Archived from the original on 26 April 2023. Retrieved 26 April 2023.
71. "OGC Approves KML as Open Standard". OpenGeospatial.org. 2008-04-14. Retrieved 2018-11-20.
72. "KML". OpenGeospatial.org. Retrieved 2018-11-20.
73. "Krita Features". krita.org. Retrieved 2022-01-16.
74. "LaTeX (.tex)".
75. "Listing of All Formats".
76. "LEDA (.gw, .lgr)".
77. "LM file - What is an LM file and how do I open it?". fileinfo.com. Retrieved 12 August 2023.
78. "LWO (.lwo)".

External links

• File Extension Resource
• The File Extensions Resource
• File information site
• File Extension Database
• File format finder
• List of file types