Alphabetic File Extension List (L)

• .L..........Source code (Lex)
• .L..........Source code (Lisp)
• .L..........Linker directive file (WATCOM wlink)
• .LAB..........Datafile (NCSS-SOLO)
• .LAB..........Label file (Visual dBase)
• .LAB..........Mailing labels (Microsoft Excel)
• .LAN..........Loadable module (LAN DLL) (NetWare)
• .LAY..........Word Chart layout (APPLAUSE)
• .LAY..........Clipart file (Printmaster Gold)
• .LBG..........Label generator data (dBase IV)
• .LBL..........Label (dBase IV)
• .LBL..........Label (Clipper 5)
• .LBL..........Label (dBFast)
• .LBM..........Bitmap (DeluxePaint)
• .LBM..........Linear Bitmap graphics (XLib)
• .LBO..........Compiled label (dBase IV)
• .LBR..........Compressed archive (LU)
• .LBR..........Display driver (Lotus 1-2-3)
• .LBT..........Labels (Microsoft FoxPro)
• .LBX..........Labels (Microsoft FoxPro)
• .LCF..........Linker control file (Norton Guides compiler)
• .LCH..........Used in a program (unknown) that monitors a network's response time
• .LCK..........Lockfile (Paradox)
• .LCL..........Datafile (FTP)
• .LCN..........Lection document (WordPerfect for Windows)
• .LCS..........Data History file (ACT!)
• .LCW..........Spreadsheet (Lucid 3-D)
• .LD..........Long distance area codes file (Telix)
• .LD1..........Overlay file (dBase)
• .LDB..........Lock file (Microsoft Access)
• .LDF..........Library definition file (Geoworks Glue)
• .LDIF..........Structured text file used for sharing information between E-Mail clients (Microsoft, Netscape and others)
• .LDL..........Library (Corel Paradox)
• .LEG..........Legacy document
• .LES..........System game profiles (same as REG file) (Logitec Entertainment)
• .LEV..........Level file (NetHack 3.x)
• .LEX..........Dictionary file (Generic)
• .LFD..........Data resource file (LucasArts Dark Forces)
• .LFP..........LaserForms Plus file (Evergreen)
• .LFT..........Loft file (3-D Studios) (DOS)
• .LFT..........Laser printer font (ChiWriter)
• .LG..........Logo procedure definition (LSRHS Logo)
• .LGC..........Application log file
• .LGD..........Application log file
• .LGO..........Logo file (PaintBrush)
• .LGO..........Header and footer logo (SuperFax)
• .LGO..........Startup logo (Microsoft Windows 3.x-9.x)
• .LHA..........Alternate file suffix for LZH
• .LHA..........Compressed Archive (LHA/LHARC)
• .LHW..........Compressed Amiga archive (LHWARP)
• .LIB..........Library file (Generic)
• .LIF..........Logical Interchange data (Hewlett-Packard)
• .LIF..........Compressed archive (Generic)
• .LIM..........Compressed archive (LIMIT)
• .LIN..........Line type file (DataCad)
• .LIN..........Interactive music sequencing data file (Electronic Arts)
• .LIS..........Output file produced by a Structured Query Reporting (SQR) program
• .LIS..........Listing (VAX)
• .LIX..........Logos library system file
• .LJ..........Text file (Hewlett-Packard LaseJet II printer)
• .LK..........Database file (OpenSight-16 bit)
• .LKO..........Linked object (Microsoft Outlook Express Junkmail file)
• .LL3..........Document file (LapLink III)
• .LLX..........Exchange agent (Laplink)
• .LNK..........Shortcut file (Microsoft Windows 9.x)
• .LNK..........Linker response file (RTLink)
• .LNK..........Datafile (Revelation)
• .LOD..........Load file (Generic)
• .LOG..........Log file (Generic)
• .LOK..........Compressed file (FileWrangler)
• .LP..........A document reader used for downloading mortgage closing information (DesertDocs)
• .LPC..........Printer driver (TEKO)
• .LPD..........Helix Nuts and Bolts file
• .LPI..........Information file for laser printers (common with some scanning sofware)
• .LRC..........Video phone file (Intel)
• .LRF..........Linker response file (Microsoft C/C++)
• .LRS..........Language resource file (WordPerfect for Windows)
• .LSF..........Logos library system file
• .LSL..........Saved library (Corel Paradox)
• .LSL..........Script library (Lotus)
• .LSP..........AutoLISP, CommonLISP, and other LISP language files
• .LSS..........Spreadsheet (Legato)
• .LST..........List file (Generic)
• .LST..........Keyboard macro (1st Reader)
• .LST..........Spool file (Oracle)
• .LTM..........Form (Lotus Forms)
• .LU..........Library unit file (ThoughtWing)
• .LVL..........Miner Descent/D2 Level extension (Parallax Software)
• .LWD..........Text document (LotusWorks)
• .LWF..........Wavelet graphics file (Luratech)
• .LWLO..........Layered Object file (Lightwave)
• .LWOB..........Object file (Lightwave)
• .LWP..........Wordpro 96/97 file (Lotus)
• .LWSC..........Scene file (Lightwave)
• .LWZ..........Linguistically enhanced sound file (Microsoft)
• .LYR..........Layer file (DataCAD)
• .LZD..........Difference file for binaries (Ldiff 1.20)
• .LZH..........Compressed archive (LH ARC)
• .LZS..........Compressed archive (LARC)
• .LZS..........Data file (Skyroads)
• .LZW..........Compressed Amiga archive (LHWARP)
• .LZX..........Compressed archive (Generic)

Alphabetic File Extension List (K)

• .K25..........Sample file (Kurzweil 2500)
• .KAR..........MIDI file (text+MIDI) (Karaoke)
• .KB..........Keyboard script (Borland C++ 4.5)
• .KB..........Program source code (Knowledge Pro)
• .KBD..........Keyboard mapping script (Procomm Plus, LocoScript, Signature)
• .KBM..........Keyboard mapping script (Reflection 4.0)
• .KCL..........Lisp source code (Kyoto Common Lisp)
• .KDC..........Image (Kodak Photo-Enhancer)
• .KEX..........Macro (KEDIT)
• .KEY..........Icon toolbar (DataCAD)
• .KEY..........Datafile (Forecast Pro)
• .KEY..........Keyboard Macro
• .KEY..........Security file (Such as a software registration number)
• .KFX..........Image (KoFax Group 4)
• .KIZ..........Digital postcard (Kodak)
• .KKW..........Contains all K-keywords in the RoboHELP Help project Index Designer not associated with topics
• .KMD..........Knowledge model, data
• .KMP..........KeyMaP (Korg Trinity)
• .KMS..........Knowledge model, shortcut
• .KMV..........Knowledge model, visual
• .KMZ..........Google Earth Saved Working Session file
• .KOS..........MicroType Pro document
• .KPL..........Kids Programming Language
• .KPP..........Toolpad (SmartPad)
• .KPS..........Bitmap graphic (IBM KIPS)
• .KQP..........Native Camera file (Konica)
• .KR1..........Sample (multi-floppy) file (Kurzweil 2000)
• .KRZ..........Sample file (Kurzweil 2000)
• .KSF..........Sample File (Korg Trinity)
• .KSF..........Stepfile format of several Pump It Up simulators
• .KYB..........Keyboard mapping (FTP)
• .KYE..........Game data (Kye)

Alphabetic File Extension List (J)

• .J2C..........JPEG 2000. Raster image
• .J2K..........JPEG 2000. Raster image
• .J62..........Ricoh camera format
• .JAR..........Java archive
• .JAR..........Java Archive; contains all files used in an applet
• .JAR..........Java ARchive file (a compressed file for applets and related files)
• .JAS..........Picture
• .JAS..........JAS Compressed Graphic File
• .JAV..........Java source code
• .JAV..........Internet Program; JAVA Microsoft Visual J++ Source Code
• .JAVA..........Java source code
• .JAVA..........Same as JAV
• .JBD..........Database; Sigma Scan
• .JBF..........Paint Shop Pro image browser file
• .JBF..........Bitmap Picture; PaintShop Pro browser
• .JBIG..........Joint Bilevel Image Group
• .JBX..........Project Scheduler 4
• .JCK..........Liquid Motion JACK Scene Description
• .JDF..........Job Definition File. Data to control print jobs.
• .JET..........Fax Document; Hybrid Jet-Fax
• .JFF..........JPEG File Format.
• .JFI..........truncated version of JFIF
• .JFIF..........JPEG File Interchange Format. Raster image in JPEG format.
• .JIF..........JPEG image
• .JIFF..........JPEG image
• .JMP..........SAS JMPDiscovery chart-to-statistics file
• .JN1..........Epic MegaGames Jill of the Jungle data file
• .JOB..........Task (Job) scheduled with the Microsoft Windows XP Task Scheduler
• .JOD..........Database; Microsoft Jet OLE Database
• .JOR..........Structured Query Language (SQL) journal
• .JP2..........JPEG 2000. Raster image
• .JPC..........JPEG Compressed. Raster image in JPEG 2000 format
• .JPC..........Japanese PIC. Raster image
• .JPE..........truncated version of JPEG
• .JPEG..........Joint Photographic Experts Group. Raster image.
• .JPG..........Joint Photographic Experts Group. Raster image.
• .JPR..........Borland JBuilder project
• .JPX..........JPEG eXtended. Raster image in JPEG 2000 format with proprietary extensions.
• .JS..........JavaScript source code
• .JS..........Internet Program; Java script; see MOCHA, PL (MIME: application/x-javascript)
• .JSP..........A HTML page containing a reference to a Java servlet
• .JSP..........Java Server Pages
• .JT..........a 3D vector image optionally with extra non-image data. Used for 3D visualizations and interchange between CAD/CAM programs.
• .JT..........Fax Document; JT Fax
• .JTF..........(2) Fax Document; Hayes JT Fax
• .JTF..........(1) Bitmap Picture; see TIF, JPG
• .JTF..........JPEG bitmap
• .JVG..........Java Vector Graphics. Image metafile (can contain vector and raster data).
• .JW..........JustWrite
• .JW..........JustWrite 1.0/2.0
• .JW..........Document; Just Write word processor
• .JWL..........Just-Write
• .JZZ..........Spreadsheet; Lotus Jazz

Alphabetic File Extension List (J)

Alphabetic File Extension List (I)

• .ICA..........Citrix file
• .ICB..........Targa bitmap
• .ICM..........Image Color Matching profile file
• .ICO..........Windows Icon
• .IDD..........MIDI Instrument Definition
• .IDQ..........Internet Data Query file
• .IFF..........Amiga ILBM
• .IGF..........Inset Systems metafile
• .IIF..........QuickBooks for Windows interchange file
• .IMA..........WinImage file
• .IMG..........GEM image
• .INC..........Assembler language or Active Server include file
• .INF..........Information file
• .INI..........Initialization file
• .INP..........Oracle source code for form, version 3.0 and earlier
• .INS..........InstallShield install script
• .INS..........X-Internet sign-up file
• .ISO..........Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
• .ISP..........X-Internet sign-up file
• .ISU..........InstallShield uninstall script
• .IT..........Impulse Tracker music module (MOD) file
• .IW..........Idlewild screensaver

Alphabetic File Extension List (I)

Alphabetic File Extension List (H)

• .H..........C program header
• .HED..........HighEdit document
• .HEL..........Microsoft Hellbender saved game
• .HEX..........Macintosh BinHex 2.0 file
• .HGL..........HP Graphics Language drawing
• .HLP..........Help file
• .HOG..........Lucas Arts Dark Forces WAD file
• .HPJ..........Visual Basic Help Project
• .HPP..........C++ program header
• .HQX..........Macintosh BinHex 4.0 file
• .HST..........History file
• .HT..........HyperTerminal
• .HTM..........Hypertext document
• .HTML..........Hypertext document
• .HTX..........Extended HTML template

Alphabetic File Extension List (H)

Alphabetic File Extension List (G)

• .GAL..........Corel Multimedia Manager album
• .GCP..........Ground Control Point file used in image processing of remote sensing data .
• .GED..........Graphic Environment Document (drawing)
• .GEM..........GEM metafile
• .GEN..........Ventura-Generated text file
• .GFC..........Patton&Patton Flowcharting 4 flowchart file
• .GFI..........Genigraphics Graphics Link presentation
• .GFX..........Genigraphics Graphics Link presentation
• .GID..........Windows 95 global index file (containing help status)
• .GIF..........CompuServe bitmap
• .GIM..........Genigraphics Graphics Link presentation
• .GIX..........Genigraphics Graphics Link presentation
• .GNA..........Genigraphics Graphics Link presentation
• .GNX..........Genigraphics Graphics Link presentation
• .GRA..........Microsoft Graph
• .GRD..........Grid file, used in image processing of remote sensing data often to form map projections.
• .GRP..........Program Manager Group
• .GTK..........Graoumftracker (old) music module (MOD) file
• .GT2..........Graoumftracker (new) music module (MOD) file
• .GWX..........Genigraphics Graphics Link presentation
• .GWZ..........Genigraphics Graphics Link presentation
• .GZ..........Unix Gzip compressed file

Alphabetic File Extension List (G)

Alphabetic File Extension List (F)

• .F..........FORTRAN file
• .F77..........FORTRAN file
• .F90..........FORTRAN file
• .FAR..........Farandole Composer music module (MOD) file
• .FAV..........Microsoft Outlook navigation bar
• .FAX..........FAX Type image
• .FH3..........Aldus Freehand 3 drawing
• .FIF..........Fractal image file
• .FITS..........CCD camera image
• .FLAC..........Free Lossless Audio Codec File
• .FLC..........AutoDesk FLIC animation
• .FLI..........AutoDesk FLIC animation
• .FLT..........Corel filter
• .FLT..........StarTrekker music module (MOD) file
• .FMB..........Oracle binary source code for form, version 4.0 and later
• .FMT..........Oracle text format of form, version 4.0 and later
• .FMT..........Microsoft Schedule+ print file
• .FMX..........Oracle executable form, version 4.0 and later
• .FOG..........Fontographer font
• .FON..........System font
• .FOR..........FORTRAN file
• .FOT..........Font-related file
• .FP..........FileMaker Pro file
• .FP1..........Flying Pigs for Windows data file
• .FP3..........FileMaker Pro file
• .FPX..........FlashPix bitmap
• .FRM..........Form
• .FRM..........FrameMaker or FrameBuilder document
• .FRM..........Oracle executable form version 3.0 and earlier
• .FRM..........Visual Basic form
• .FRM..........WordPerfect Merge form
• .FRX..........Visual Basic form stash file

Alphabetic File Extension List (F)