| ll3 | LapLink 3 Data |
| lla | PROJ.4 LLA Data |
| lld | Loan Level Disclosure Data |
| llge | Microsoft Windows Application Log |
| lli | Autodesk AutoCAD Landscape Library |
| llt | Liquidity Lighthouse Transaction Data |
| llv | Lizard Safeguard PDF Security License File |
| lm | ARPA-MIT Language Model File |
| lm3 | Bosphorus 3D Landmarking Database |
| lm4 | Steinberg LM-4 Program |
| lmat | LayaAir Material Data |
| lmb | LogoManager Backup File |
| lmc | Library Manager Database |
| lmd | Abbyy FineReader Morphological Model |
| lmf | Altera Library Mapping File |
| lmg | CryENGINE Locomotion Manager Group Animation |
| lmi | Homeportal SW1000 Firmware Recovery Data |
| lmk | Sprint-Layout Macro File |
| lml | Log Markup Language Document |
| lmlpack | Kashmir 3D LML Package |
| lmq | LinMailPro Queue Data |
| lmr | Intuit Quickbooks Loan Manager Data |
| lms | Light-O-Rama Musical Sequence |
| lmx | Nokia Landmark Exchange File |
| lng | Adobe RoboHelp Language Data |
| lngx | KeePass v2 Language Data |
| lnml | LonWorks LON XML File |
| lns | AVG Language Data |
| lo1 | Pervasive DataExchange Log |
| lo2 | Pervasive DataExchange Log |
| lo3 | Pervasive DataExchange Log |
| lo4 | Pervasive DataExchange Log |
| lo5 | Pervasive DataExchange Log |
| loa | MAXQDA Saved Formula |
| lob | IBM DB2 Large Object Data |
