List of filename extensions (F–L)

Short description: none

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

## Contents

* 1 F
* 2 G
* 3 H
* 4 I
* 5 J
* 6 K
* 7 L
* 8 See also
* 9 Notes
* 10 References
* 11 External links

## 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
FEN[7] | Forsyth–Edwards Notation | Chess applications -text data describes a specific position.
FF | Farbfeld image  |
FFN[3][4][2] | FASTA format nucleotide of gene regions  |
Fit | CurvFit Input file format  | CurvFit software
FITS[8][9] | Flexible Image Transport System  | astronomy software
FLAC[10] | Audio codec, Audio file format  |
FLAME | Fractal configuration file  | Apophysis
FLP | FL Studio project file  | FL Studio
FLV[11] | A container format for Flash Video (see also SWF)  | Adobe Flash
FNA[2][3][4] | FASTA format nucleic acid  |
FNI | FileNet Native Document  | FileNet
FNX | Saved notes with formatting in markup language  | FeatherNote
FODG[12] | OpenDocument Flat XML Drawings and vector graphics  | OpenDocument, LibreOffice, Collabora Online
FODP[12] | OpenDocument Flat XML Presentations  | OpenDocument, LibreOffice, Collabora Online
FODS[12] | OpenDocument Flat XML Spreadsheets  | OpenDocument, LibreOffice, Collabora Online
FODT[12] | OpenDocument Flat XML Text Document  | OpenDocument, LibreOffice, Collabora Online
FOR | Fortran language source file  | many
FQL[13] | 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[14] | 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[15] | ANTLR4 grammar  | ANTLR4
GBR[16] | Gerber format | PCB CAD/CAM
GDF[17] | General Data Format for Biomedical Signals | Biomedical signal processing, Brain Computer Interfaces
GDT | Gerätedatentransfer, an xDT application  | Healthcare providers in Germany
GED[18] | GEDCOM | Genealogy data exchange
GGB | GeoGebra File  | GeoGebra
GIF[19] | Compuserves' Graphics Interchange Format (bitmapped graphics)  | QPeg - Display - CompuShow
GM9[20] | Scripts for GodMode9  | Godmode9
GMI  | Gemtext markup language[21] | Gemini (Protocol)
GMK  | GameMaker Project File  | YoYo Games
GML[22] | Geography Markup Language File  | Geography Markup Language
GO | Go source code file  | Go (Programming language)
GREXLI  | Uncompressed folder as a file  | WinGrex/GrexliLib
GSF | Generic sensor format | Used for storing bathymetry data, such as that gathered by a multibeam echosounder.
GPX[23][24] | GPS eXchange Format  |
GRP  | Data pack files for the Build Engine | Duke Nukem 3D
GTF[25] | Gene transfer format |
GV[26] | Graph Visualization | Graphviz
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[27]
HAR[28] | HTTP Archive format (JSON-format web-browser log)  | W3C draft standard
HDI  | Hard Disk Image file (PC-9800 disk image file)  | PC-9800 emulators
HDMP | heap dumpfile  |
HH | C++ header file  |
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[29] | Hypertext Markup Language (WWW)  | Netscape - Mosaic \- many
HUM | 3D Model database  | OMSI The Bus Simulator
HXX | C++ header file  |

## I

Ext. | Description | Used by

|
|

ICC[30] | ICC profile | Color Configuration for color input or output devices
ICE | LHA Archive  | Cracked LHA (old LHA), Total Commander
ICL | Icon library  | Microsoft Windows
ICO | Icon file  | ICONEDIT.EXE; Microsoft Windows
IFC[31] | 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[32] | Flight tracks downloaded from GPS devices in the International Gliding Commission's prescribed format  |
IGES[33] | Initial Graphics Exchange Specification |
IMG | Disk image  |
INFO | Texinfo hypertext document  | Texinfo, info (Unix), Emacs
INI[34] | Configuration file |
IO[35] | Archive  | CPIO
IPT | XnView IPTC template  | XnView, XnViewMP
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[36] | JPEG 2000 image  | JPEG 2000
JAR[37] | Java archive  | JAR, Java Games and Applications
JAV[38] | see JAVA  |
JAVA[38] | Java source code file  |
JBIG[39][40][41] | Joint Bilevel Image Group  |
JNLP[42] | Java Network Launching Protocol  | Java Web Start
JP2[36] | JPEG 2000 image  |
JPE[43] | Joint Photographic Experts Group graphics file format  | Minolta/Konica Minolta cameras use this for JPEGs in Adobe RGB color space
JPEG[43] | Joint Photographic Experts Group graphics file format  | QPeg - FullView - Display
JPG[43] | Joint Photographic Group  | various (Minolta/Konica Minolta cameras use this for JPEGs in sRGB color space)
JS[44] | JavaScript file  | script in HTML pages
JSON[45][46] | JSON (JavaScript Object Notation)  | Ajax
JSP[47] | Jakarta Server Pages | Dynamic pages running Web servers using Java technology
JXL | JPEG XL raster graphics file

## K

Ext. | Description | Used by

|
|

KEY  | Keynote Presentation  | Keynote
KLC[48] | MSKLC Source file  | Microsoft Keyboard Layout Creator
KML[49][50] | Keyhole Markup Language | Google Earth
KMZ[49][50] | Keyhole Markup Language (Zip compressed)  | Google Earth
KO  | Linux kernel module format system file  | Linux
KRA[51] | Krita image file  | Krita
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
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
LHA | LHA Archive  | LHA/LHARC, Total Commander
LISP | LISP source code file  |
LL | LLVM Assembly Language  | llvm
LM  | Language Model File[52] | Microsoft Windows
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)
LZ | Archive  | Lzip

## See also

* List of filename extensions
* List of file formats

## Notes

## References

1. ↑ "F4V/FLV Technology Center". Adobe. https://www.adobe.com/devnet/f4v.html.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "Alignment Fileformats". 22 May 2019. http://www.jalview.org/help/html/io/fileformats.html.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "Rapid and sensitive protein similarity searches". Science 227 (4693): 1435–41. March 1985. doi:10.1126/science.2983426. PMID 2983426. Bibcode: 1985Sci...227.1435L.
4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "Improved tools for biological sequence comparison". Proceedings of the National Academy of Sciences of the United States of America 85 (8): 2444–8. April 1988. doi:10.1073/pnas.85.8.2444. PMID 3162770. Bibcode: 1988PNAS...85.2444P.
5. ↑ "FictionBook 2.0 Specification". http://gribuser.ru/xml/fictionbook/index.html.en.
6. ↑ "Autodesk FBX Files | 3ds Max | Autodesk Knowledge Network" (in en-US). https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/3DSMax/files/GUID-26E80277-1645-4C4E-A6B2-44399376490F-htm.html.
7. ↑ "Standard: Portable Game Notation Specification and Implementation Guide". 12 March 1994. https://archive.org/download/pgn-standard-1994-03-12/PGN_standard_1994-03-12.txt. The page linking to the document is here.
8. ↑ "Flexible Image Transport System: a new standard file format for long-term preservation projects?". Vatican City. 2012-07-05. http://www.vaticanlibrary.va/moduli/Allegrezza_EWASS2012.pdf. Retrieved 2013-03-06.
9. ↑ "IAU FITS Working Group". NASA. http://fits.gsfc.nasa.gov/iaufwg/iaufwg.html.
10. ↑ Coalson, Josh. "FLAC - format". https://xiph.org/flac/format.html#stream. Retrieved 4 April 2013. ""fLaC", the FLAC stream marker in ASCII, meaning byte 0 of the stream is 0x66, followed by 0x4C 0x61 0x43"
11. ↑ "Video File Format Specification Version 10". Adobe. November 2008. https://www.adobe.com/content/dam/acom/en/devnet/flv/video_file_format_spec_v10.pdf.
12. ↑ 12.0 12.1 12.2 12.3 "Open Document Format for Office Applications (OpenDocument) Version 1.3. Part 3: OpenDocument Schema". 2021-04-27. https://docs.oasis-open.org/office/OpenDocument/v1.3/os/part3-schema/OpenDocument-v1.3-os-part3-schema.html.
13. ↑ "Fauna Query Language". https://docs.fauna.com/fauna/current/api/fql/.
14. ↑ "MySQL .frm File Format". https://dev.mysql.com/doc/internals/en/frm-file-format.html.
15. ↑ "Collection of Antlr4 grammars". https://github.com/antlr/grammars-v4.
16. ↑ "Gerber Format". 2020-04-09. https://www.ucamco.com/en/gerber.
17. ↑ Schlögl, Alois (2006). "GDF - A general dataformat for biosignals". arXiv:cs/0608052v10.
18. ↑ "GEDCOM X Specifications". http://www.gedcomx.org/Specifications.html.
19. ↑ "Graphics Interchange Format, Version 89a". W3C. 31 July 1990. http://www.w3.org/Graphics/GIF/spec-gif89a.txt. Retrieved 6 March 2009.
20. ↑ Homebrew, Nintendo. "GodMode9 Usage" (in en). https://3ds.hacks.guide/godmode9-usage.html.
21. ↑ "Project Gemini". https://gemini.circumlunar.space/docs/specification.gmi.
22. ↑ Open Geospatial Consortium Inc. (2010-02-08) (PDF), Technical Committee Policies and Procedures: MIME Media Types for GML, http://portal.opengeospatial.org/files/?artifact_id=37743
23. ↑ "GPX: the GPS Exchange Format". https://www.topografix.com/gpx.asp.
24. ↑ "OpenGIS Geography Markup Language (GML) Encoding Standard". http://www.opengeospatial.org/standards/gml. Retrieved 2011-03-25.
25. ↑ "GTF2.2: A Gene Annotation Format". https://mblab.wustl.edu/GTF22.html.
26. ↑ "Graphviz - Graph Visualization Software". http://graphviz.org/.
27. ↑ "HHVM 4.0.0". http://hhvm.com/blog/2019/02/11/hhvm-4.0.0.html.
28. ↑ "HTTP Archive (HAR) format". W3C Web Performance Working Group. 2012-08-14. https://w3c.github.io/web-performance/specs/HAR/Overview.html. Retrieved 2019-05-18.
29. ↑ "HTML Standard". https://html.spec.whatwg.org/multipage/.
30. ↑ "ICC Specifications". 2020. https://www.color.org/icc_specs2.xalter.
31. ↑ "Certified Software". 23 June 2022. https://www.buildingsmart.org/compliance/software-certification/certified-software/.
32. ↑ "IGC Flight Recorder Specification Edition 2 with AL5 2019-10-30". 3 August 2017. https://www.fai.org/page/igc-approved-flight-recorders.
33. ↑ 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
34. ↑ Archiveddocs (22 February 2013). "Configure an Ini File Item" (in en-us). https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/cc731332(v=ws.11).
35. ↑ "Cpio". GNU.org.
36. ↑ 36.0 36.1 JPEG. "Joint Photographic Experts Group, JPEG2000". http://www.jpeg.org/jpeg2000/index.html.
37. ↑ "JAR File Specification". Oracle Corporation. https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html.
38. ↑ 38.0 38.1 "The Java Language Specification, 2nd Edition". https://java.sun.com/docs/books/jls/second_edition/html/intro.doc.html#237601.
39. ↑ 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. https://web.archive.org/web/20131231055215/http://kikaku.itscj.ipsj.or.jp/sc29/29w12901.htm. Retrieved 2009-11-11.
40. ↑ ISO/IEC JTC 1/SC 29. "Programme of Work, (Allocated to SC 29/WG 1)". Archived from the original on 2013-12-31. https://web.archive.org/web/20131231012300/http://kikaku.itscj.ipsj.or.jp/sc29/29w42901.htm. Retrieved 2009-11-07.
41. ↑ ISO. "JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information". http://www.iso.org/iso/standards_development/technical_committees/list_of_iso_technical_committees/iso_technical_committee.htm?commid=45316. Retrieved 2009-11-11.
42. ↑ "JSR 56: Java Network Launching Protocol and API". https://www.jcp.org/en/jsr/detail?id=56.
43. ↑ 43.0 43.1 43.2 "T.81 – DIGITAL COMPRESSION AND CODING OF CONTINUOUS-TONE STILL IMAGES – REQUIREMENTS AND GUIDELINES". CCITT. September 1992. https://www.w3.org/Graphics/JPEG/itu-t81.pdf. Retrieved 12 July 2019.
44. ↑ "ECMAScript 2020 Language Specification". https://tc39.es/ecma262/#sec-overview.
45. ↑ "Standard ECMA-404 - The JSON Data Interchange Syntax". Ecma International. December 2017. p. 1, footnote. https://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf. Retrieved 27 October 2019.
46. ↑ "ISO/IEC 21778:2017". http://www.iso.org/cms/render/live/en/sites/isoorg/contents/data/standard/07/16/71616.html.
47. ↑ "JSR 245: JavaServer Pages 2.1". 2013-06-12. https://jcp.org/en/jsr/detail?id=245.
48. ↑ "MSKLC Guide". 26 April 2023. https://msklc-guide.github.io/.
49. ↑ 49.0 49.1 "OGC Approves KML as Open Standard". 2008-04-14. http://www.opengeospatial.org/pressroom/pressreleases/857. Retrieved 2018-11-20.
50. ↑ 50.0 50.1 "KML". http://www.opengeospatial.org/standards/kml. Retrieved 2018-11-20.
51. ↑ "Krita Features". https://krita.org/en/item/krita-features/. Retrieved 2022-01-16.
52. ↑ "LM file - What is an LM file and how do I open it?". https://fileinfo.com/extension/lm.

## External links

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

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