| L | Game Of Life File | Data Files | 20 | 4 |
| L16 | JRiver Media Center File |
Data Files
| 1 | 1 |
| L2D | Cadwork File | CAD Files | 1 | 1 |
| L2L | IBM Voice Type Languages Addword File | Uncommon Files | 1 | 1 |
| L2P | IBM Voice Type Languages Addword Data |
Data Files
| 1 | 1 |
| L2R | Lineage II Replay File | Game Files | 1 | 1 |
| L4D | Cinema 4D Layout File | Settings Files | 1 | 1 |
| L5K | RSLogix 5000 File |
Data Files
| 1 | 1 |
| L64 | 64LAN Image File |
Settings Files
| 1 | 1 |
| L6T | Line 6 Tone File |
Data Files
| 4 | 1 |
| LA | Lossless Audio File | Audio Files | 5 | 2 |
| LA1 | LucasArts Game Data File |
Game Files
| 3 | 2 |
| LAA | LucasArts AdLib Audio File Format |
Audio Files
| 1 | 1 |
| LAB | WordPerfect Label Definition File | Page Layout Files | 2 | 2 |
| LABEL | DYMO Label File |
Data Files
| 1 | 1 |
| LAC | Cognos Local Authentication Cache |
Data Files
| 1 | 1 |
| LACCDB | Microsoft Access Lock File |
Page Layout Files
| 1 | 1 |
| LAD | Daylon Leveller Animation Data | Graphic Files | 1 | 1 |
| LAF | Lingoes Appendix File | Plugin Files | 1 | 1 |
| LAK | Kashmir Data | 3D Image Files | 1 | 1 |
| LAM | Netscape Media Player Streaming Audio Metafile |
Audio Files
| 1 | 1 |
| LAN | ERDAS LAN File | GIS Files | 6 | 3 |
| LANG | Minecraft Language File |
Game Files
| 3 | 2 |
| LAO | EPSON SMART PANEL File |
Data Files
| 1 | 1 |
| LAP | Scheme Source Code |
Uncommon Files
| 3 | 1 |
| LAR | Liquid Audio Player Registration File Format |
Data Files
| 1 | 1 |
| LARGE | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| LAS | LIDAR Data Exchange File |
Data Files
| 3 | 1 |
| LASSO | Lasso Database-Driven Web Page | Web Files | 9 | 1 |
| LAST | Valve Steam Data |
Data Files
| 1 | 1 |
| LASXML | Laser App Data Exchange |
Data Files
| 1 | 1 |
| LAT | LaTeX File |
Data Files
| 1 | 1 |
| LAUNCH | Zend Studio Debugger Configuration Data |
Settings Files
| 2 | 1 |
| LAUNCHER | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| LAV | DNA Sequence Alignment File |
Data Files
| 2 | 2 |
| LAVS | Liquid Audio Secured Download File |
Data Files
| 1 | 1 |
| LAW | eLawForms |
Data Files
| 1 | 1 |
| LAX | AnetHelpTool JavaHelp Viewer Data | Text Files | 1 | 1 |
| LAY | Tecplot Layout File |
Data Files
| 4 | 6 |
| LAY6 | Sprint-Layout Document |
CAD Files
| 1 | 1 |
| LAYOUT | Apple MainStage Layout Data |
Settings Files
| 5 | 4 |
| LAZ | LiquidApps Project File |
Data Files
| 2 | 2 |
| LA_ | TI Databook File |
Data Files
| 1 | 1 |
| LB | Lens Blur Project File | Raster Image Files | 1 | 1 |
| LBA | Liberty BASIC Source Code |
Data Files
| 2 | 2 |
| LBB | Liberty Bible DataBase File |
Uncommon Files
| 1 | 1 |
| LBD | Life Balance User Data File |
Data Files
| 1 | 1 |
| LBE | Life Balance Xml-based Exchange Data |
Data Files
| 1 | 1 |
| LBF | LG Backup File | Backup Files | 1 | 1 |
| LBI | Dreamweaver Library Item | Developer Files | 4 | 2 |
| LBK | VersaPro Local Logic Block Backup |
Backup Files
| 1 | 1 |
| LBL | Now Contact Label Template |
Page Layout Files
| 5 | 5 |
| LBM | Deluxe Paint Bitmap Image File |
Data Files
| 4 | 2 |
| LBP | ProWORX Nxt Logic Pointer Data |
Data Files
| 1 | 1 |
| LBR | LU Library Archive | Compressed Files | 5 | 4 |
| LBS | Omnis Library |
Developer Files
| 1 | 1 |
| LBT | FoxPro Label Memo |
Text Files
| 1 | 1 |
| LBU | Cloaked Affiliate Link Builder Settings File |
Settings Files
| 1 | 1 |
| LBW | CCP Log Server Utility Log File |
Game Files
| 1 | 1 |
| LBX | FoxPro Label File |
Data Files
| 1 | 1 |
| LBXCOL | Libronix DLS Resource Collection File | eBook Files | 1 | 1 |
| LBXLBK | Libronix Digital Library System (DLS) License Backup |
Backup Files
| 1 | 1 |
| LBXLLS | Logos Libronix 3.0 Data |
Data Files
| 1 | 1 |
| LBXUPD | Libronix DLS Update Script |
Developer Files
| 1 | 1 |
| LBXWKS | Libronix DLS Workspace |
Data Files
| 1 | 1 |
| LCB | Living Cookbook Backup File |
Backup Files
| 1 | 1 |
| LCC | IBM Voice Type Languages Newuser File |
Data Files
| 3 | 3 |
| LCD | ABBYY Language File |
Data Files
| 3 | 2 |
| LCF | ArchiCAD Library Container File |
CAD Files
| 1 | 1 |
| LCK | Program Lock File |
Uncommon Files
| 3 | 1 |
| LCN | License File | Encoded Files | 2 | 2 |
| LCO | Railroad Tycoon 3 Locomotive Properties |
Game Files
| 1 | 1 |
| LCP | FARSITE Landscape Data |
Data Files
| 1 | 1 |
| LCR | NEC Electra Elite LCR Customer Database | Database Files | 1 | 1 |
| LCS | ACT! History Data |
Data Files
| 3 | 3 |
| LCT | Oracle Database Configuration File |
Database Files
| 2 | 2 |
| LCW | Lucid 3-D Spreadsheet | Spreadsheet Files | 1 | 1 |
| LCX | LC Model |
Data Files
| 4 | 1 |
| LD | Telix Long Distance Codes Data |
Data Files
| 2 | 1 |
| LD1 | dBASE Overlay File |
Database Files
| 3 | 1 |
| LD2 | Lingoes Dictionary File |
Data Files
| 1 | 1 |
| LDA | LaserData Image Format File |
Graphic Files
| 1 | 1 |
| LDB | Microsoft Access Lock File |
Page Layout Files
| 3 | 3 |
| LDC | Steuer 2001 File |
Uncommon Files
| 1 | 1 |
| LDF | SQL Server Transaction Log File |
Data Files
| 3 | 2 |
| LDH | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| LDI | LDIF File |
Text Files
| 10 | 1 |
| LDIF | LDAP Data Interchange Format File |
Data Files
| 3 | 1 |
| LDL | Corel Paradox Delivered Library File |
Data Files
| 1 | 1 |
| LDN | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| LDP | Lingoes Dictionary File |
Data Files
| 3 | 3 |
| LDS | Binutils LD Linker Script |
Developer Files
| 9 | 4 |
| LDT | Eulumdat Formatted Luminaire Data File |
CAD Files
| 4 | 3 |
| LDW | Virtual Villagers Saved Game File |
Game Files
| 1 | 1 |
| LDX | Liquid Studio Compiled Executable |
Data Files
| 2 | 2 |
| LE | DOS/4GW PM 32X DOS Extender Executable Image | Executable Files | 1 | 1 |
| LEA | Unknown File Type |
Uncommon Files
| 1 | 1 |
| LEC | LucasArts Game Resource |
Game Files
| 1 | 1 |
| LED | Sony AIBO LED Lights Control Data |
Settings Files
| 1 | 1 |
| LEF | Lenex XML Data |
Text Files
| 2 | 1 |
of 4 
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