List of Data File Formats Starting with the Letter "L"
| .l | Lex source code file |
| Lisp source code file | |
| Linker directive file (WATCOM wlink) | |
| .l01 | ARC Digitized Raster Graphics |
| .lab | Datafile (NCSS - SOLO) |
| Mailing labels (Q+E for MS Excel) | |
| .lang | Skype Language file |
| .lat | Crossword Express Lattice file |
| .latex | LaTeX typesetting system |
| .lay | Word chart layout (APPLAUSE) |
| .lbg | Label generator data (dBASE IV) |
| .lbl | Label (dBASE IV - Clipper 5 - dBFast) |
| .lbm | Bitmap graphics (DeluxePaint) |
| Linear bitmap graphics (XLib) | |
| .lbo | Compiled label (dBASE IV) |
| .lbr | Compressed file archive created by LU (lue220.arc) |
| Display driver (Lotus 1-2-3) | |
| .lbt | Label memo (FoxPro) |
| .lbx | Label (FoxPro) |
| .lcf | Linker Control File (Norton Guides compiler) |
| .lck | Lockfile (Paradox) |
| .lcl | Data (FTP Software PC/TCP) |
| .lcn | Lection (WordPerfect) |
| .lcs | Datafile (ACT! History Files) |
| L0phtCrack Audit file | |
| .lcw | Spreadsheet (Lucid 3-D) |
| .ld | Long Distance codes file (Telix) |
| .ld1 | Overlay file (dBASE) |
| .ldb | Data (MS Access) |
| .ldf | Library definition file (Geoworks Glue) |
| locking data file or (locking security file) | |
| IBM Works for OS/2 Filer Form | |
| Microsoft SQL Server Transaction Log File | |
| .ldif | LDAP Data Interchange Format |
| .leg | Legacy Graphic Format |
| .les | Lesson (check *.cbt) |
| .let | Letter |
| .lev | Level file (NetHack 3.x) |
| .lex | Lexicon (dictionary) (many) |
| .lfa | LifeForm file |
| .lft | Laser printer font (ChiWriter) |
| .lg | Logo procedure definitions (LSRHS Logo) |
| .lgc | Program Use Log file |
| .lgo | Logo for header and footer (SuperFax) |
| Startup logo code (Windows 3.x) | |
| .lgx | Gerber file |
| .lha | Compressed file archive created by LHA/LHARC (lha255b.exe) |
| .lhw | Compressed Amiga file archive created by LHWARP |
| .lib | Library file (several programming languages) |
| .lic | License file (Shareware) |
| FLAMES License File Professional Edition (Ternion) | |
| .lid | Kodak Gallery Album file |
| WinDVD file | |
| Light Field Description file | |
| Dylan Library Interchange Description | |
| LabelVision Auto Incrementing Value file | |
| Maple V Setup file | |
| Scholar's Aid Backup file | |
| .lif | Logical Interchange Format data file (Hewlett-Packard) |
| Compressed file archive | |
| .lim | Compressed file archive created by LIMIT (limit12.zip) |
| .lin | Line types (AutoCAD) |
| .lis | Listing (VAX) |
| .lit | MS Reader eBook file |
| .lix | Extend Simulation Library file |
| Libronix DLS Resource (LLS 2.x Index) | |
| .lj | Text file for HP LJ II printer |
| .lko | MS Outlook Express Linked Object |
| .ll3 | Laplink III related file (document) (LapLink III) |
| .lmp | Lump File |
| .lmt | Nokia PC Suite Log file |
| RPG Maker map tree file | |
| .lnd | 3D Landscape Data |
| .lng | Adobe Acrobat Language Plugin file |
| Diablo II file | |
| NRG SDR Language file | |
| .lnk | Windows Shortcut file |
| Linker response file (.RTLink) | |
| .loc | MicroSim PCBoard Component Locations Report |
| Suppose Locations file | |
| Download format for search results on Geocaching.com | |
| .lod | Load file |
| .log | Log file |
| .lok | Encrypted and compressed archive format (FileWrangler, SecurDesk!, ZipWrangler) |
| .lpc | Printer driver (TEKO) |
| .lpd | Helix Nuts and Bolts File |
| Avery Label Pro | |
| .lpf | Lytec's Direct Electronic Medical Claims ClaimsDirect |
| .lpi | Live Pictures |
| .lpk | Licensed ActiveX Control for Internet Explorer. |
| .lrf | Linker response file (MS C/C++) |
| .lrs | Language Resource File (WordPerfect for Win) |
| .lse | Nokia Audio Manager |
| .lsf | Streaming Audio/Video file |
| Libronix DLS Resource | |
| .lsl | Lotus Script Library |
| .lsp | Lisp source code file (Xlisp) |
| .lss | Spreadsheet (Legato) |
| .lst | Keyboard macro (1st Reader) |
| List file (archive index - compiler listfile) | |
| Spool file (Oracle) | |
| SAS Program file | |
| .lt2 | e frontier Poser file |
| .ltm | Form (Lotus Forms) |
| .ltr | Letter |
| .lua | Lua Source Code file |
| .lvl | Game Level file |
| .lvp | Lucent Voice Player |
| LView Pro | |
| .lwa | LightWorks Archive Material/Scene file |
| .lwd | Text document (LotusWorks) |
| .lwo | NewTek Lightwave Object |
| .lwp | IBM Word Pro / Lotus Word Pro 96/97 document file |
| .lwz | MS Linguistically Enhanced Sound file |
| .lx | Lexico - files with source code |
| .lyr | DataCAD Layer file |
| .lzd | Difference file for binaries (Ldiff 1.20) |
| .lzh | Compressed file archive created by LHA/LHARC (lha255b.exe) |
| .lzs | Compressed file archive created by LARC (larc333.zip) |
| .lzw | Compressed Amiga file archive created by LHWARP |
| .lzx | Compressed file |
