Alphabetically: L
Extension File Description File Type
.l
Left Audio Channel File
Audio
.l3d
Black & White Graphics File
Game
.l6t
Line 6 Tone File
Data
.la
Lossless Audio File
Audio
.lab
WordPerfect Label Definition File
Layout
.laccdb
Microsoft Access Lock File
Data
.lang
Skype Language File
Settings
.las
LIDAR Data Exchange File
Data
.lasso
Lasso Database-Driven Web Page
Web
.latex
LaTeX Document
Text
.lay
DVD Studio Pro Layout File
Misc
.lbc
Cloaked Affiliate Link Builder Saved Link
Web
.lbi
Dreamweaver Library Item
Developer
.lbl
NiceLabel Template File
Data
.lbm
Deluxe Paint Bitmap Image
Raster Image
.lbr
LU Library Archive
Compressed
.lbs
Omnis Library
Developer
.lbt
FoxPro Label Memo
Text
.lbu
Cloaked Affiliate Link Builder Settings File
Settings
.lbx
FoxPro Label File
Data
.lcb
Living Cookbook Backup File
Backup
.lcd
CDSpace Emulated Disk Image
Disk Image
.lcf
ArchiCAD Library Container File
CAD
.lck
Program Lock File
Misc
.lcm
Lipikar Custom Map File
Data
.ldb
Microsoft Access Lock File
Misc
.ldf
SQL Server Transaction Log File
Data
.ldif
LDAP Data Interchange Format File
Data
.ldm
VolumeViz Multi-Resolution Volume File
3D Image
.ldr
LDraw Model File
CAD
.lds
Linux Compile Time Header File
Developer
.ldw
Virtual Villagers Saved Game File
Game
.lemon
LemonShare.net Download
Compressed
.lex
Adobe Linguistic Library Data File
Data
.lgc
SimpleK Database File
Database
.lgf
PMSCAN Log File
Data
.lgh
HMI Historical Log File
Data
.lgi
Multimedia Logic File
Data
.lgl
LeechGet Download List
Game
.lgo
Logo Instructions File
Developer
.lgp
Final Fantasy Media Archive
Game
.lgt
Let's Go! Theme File
Settings
.lha
LHARC Compressed Archive
Compressed
.lhs
Literate Haskell Script
Developer
.lib
Generic Data Library
Data
.lic
Software License
Settings
.licenses
Visual Studio Licensed Classes File
Developer
.licx
Visual Studio License File
Developer
.lid
Kodak EasyShare Album File
Misc
.lif
TurboTax Information Archive
Data
.lily
PCSX2 LilyPad Configuration File
Settings
.lin
AutoCAD Linetype File
CAD
.link
iPod Link File
Misc
.linx
iPod Links Folder
Misc
.lip
Bethesda Softworks Lip Sync File
Game
.lis
VAX Program Listing
Developer
.lisp
Lisp Source Code File
Developer
.lit
eBook File
Text
.livereg
Symantec Antivirus Session File
Data
.liveupdate
Symantec LiveUpdate File
Data
.lix
Logos Library System File
Data
.ll
List & Label Preview File
Game
.llb
LabVIEW Library File
Data
.llm
Linden Lab Mesh File
3D Image
.llx
LabVIEW VI Library Backup File
Backup
.lms
LenMus Score File
Data
.lmu
RPG Maker Map File
Game
.lmx
Landmark Exchange File
Data
.lnd
3D Landscape File
3D Image
.lng
Acrobat Language Plug-in
Plugin
.lnk
File Shortcut
System
.lnst
Adobe InDesign Line Presets File
Settings
.lnt
PC-lint/FlexeLint Configuration File
Developer
.lnx
Atari Lynx ROM
Disk Image
.lo
Interleaf Compiled Lisp File
Executable
.loc
GPS Location File
Data
.lock
Lock File
Misc
.lod
Heroes of Might and Magic 3 Graphics File
Game
.log
Log File
Text
.log1
Windows Registry Hive Log File
System
.log2
Windows Registry Hive Log 2 File
System
.logonvista
LogonStudio Windows Vista Logon Screen
Misc
.logonxp
LogonStudio Windows XP Logon Screen
Misc
.lol
LOLCODE Source Code FIle
Developer
.loov
Smadav Virus Definitions File
Misc
.lop
Mastercook Layout File
Settings
.lp2
iLEAP Word Processing Document
Text
.lp7
LP7 Digitally Signed File
Data
.lpk
ArcGIS Layer Package
GIS
.lproj
Localized Project Folder
Developer
.lps
Bryce Leaf Shape File
3D Image
.lqr
SQ Compressed LBR Archive
Compressed
.lqt
Liquid Audio File
Audio
.lrc
Lyrics File
Misc
.lrcat
Adobe Photoshop Lightroom Catalog File
Data
.lrdata
Adobe Photoshop Lightroom Data File
Data
.lrf
Sony Portable Reader File
Data
.lrs
Librie Reader Source File
Data
.lrtemplate
Adobe Photoshop Lightroom Template
Settings
.lrx
Sony Portable Reader File
Data
.lsd
RPG Maker Game Save File
Game
.lsf
Logos Library System File
Data
.lsl
LightScribe Label
Data
.lso
Logic Audio Project
Audio
.lsp
LANsurveyor Poll List
Data
.lsr
LANsurveyor Report
Data
.lst
Data List
Text
.lsu
LANsurveyor Map
Data
.lsw
RPG Maker Saved Game File
Game
.lsx
Streaming Media Shortcut
Video
.lt2
Poser Light Set File
3D Image
.ltf
Frogans Shortcut File
Misc
.ltr
Letter File
Text
.ltx
LaTeX Document
Text
.ltz
Compressed Poser Light Set File
3D Image
.lua
Lua Source File
Developer
.lue
Norton LiveUpdate Log File
Text
.luf
Lipikar Uniform Format File
Text
.luxb
Lux Map File
Game
.lva
Logitech Video Effects Avatar File
Settings
.lvf
Logitech Video Effects File
Settings
.lvl
Game Level File
Game
.lvm
LabVIEW Measurement File
Data
.lvp
Avaya Voice Player Audio File
Audio
.lvw
Livewire Document
Data
.lw4
Lightwright File
Data
.lwfn
Adobe Type 1 Mac Font File
Font
.lwo
LightWave 3D Object File
3D Image
.lwp
Lotus Word Pro Document
Text
.lws
LightWave 3D Scene File
3D Image
.lwtp
LimeWire Theme Pack
Misc
.lwv
Linguistically Enhanced Sound File
Audio
.lxa
Microsoft Speech Lexicon File
Misc
.lxf
LEGO Digital Designer Model File
3D Image
.lxfml
LEGO Digital Designer XML File
Text
.ly
LilyPond File
Data
.lyr
ArcView Layer File
Misc
.lyt
TurboTax Install Log File
Text
.lyx
LyX Document
Text
.lz
Lzip Compressed File
Compressed
.lzh
LZH Compressed File
Compressed
.lzm
Slax Module
Compressed
.lzma
LZMA Compressed File
Compressed
.lzo
LZO Compressed File
Compressed
.lzx
Amiga LZX Compressed File
Compressed