| ldk | Larson Davis System 824 Firmware Authorization Data |
| ldl | Paradox Delivered Library |
| ldm | Sybase PowerDesigner Logical Data Model |
| ldml | Adobe GoLive LDML Data |
| ldmt | Likno Drop-Down Menu Trees Data |
| ldp | Active Directory Exported LDAP Data |
| Lingoes Dictionary Data |
| ldr | eSignal Hotlist Data |
| lds | Laser Dispatch Script |
| VSE/VSAM Linear Data Set |
| ldsx | STAAD Advanced Concrete Design Cases and Combinations Data |
| ldt | EULUMDAT File |
| Oracle Generic Loader Data File |
| Zemax EULUMDAT Data |
| ldx | Lingoes Installed Dictionary Data |
| ldy | RAMAS Landscape Data |
| leases | DHCP Leases Database |
| led | AIBO LED File |
| lef | EnCase Logical Evidence Data |
| LEN Exchange Format File |
| lei | Leica SP1 Image Session Data |
| lel | LayoutEditor Library Data |
| len | Esko PlatePrep Len File |
| lens | Autodesk Stitcher Camera Profile Data |
| leo | Leo Editor Outline Data |
| lepf | Little Endian Prebuilt Format File |
| ler | LopeEdit Results Data |
| les | LayoutEditor Schematic Data |
| Mklesson Lesson File |
| TurboWin LES Data |
| lesshst | Less History File |
| let | Genesis 2000 LET Data |
| Warrior List Export Template |
| lev | CARE-S InfoWorks Level Data |
| ENVI Contour Levels Data |
| Levelogger Software Data |
| lex | Adobe InDesign Proximity Dictionary |
| HP-71 Basic Extension |
| Lex Data |
| Microsoft Office Custom Dictionary |
| SmartWare Dictionary Data |
| lexe | SciTE Data |
| lext | Olympus LEXT Measurement Export Data |
| lfa | IncrediMail Animation Data |
| Life Forms Studio Motions Data |
| lfb | Laserfiche Briefcase |
| lfe | Laserfiche Shortcut |
| lfg | LensForge Lens Design Specification |
| lfi | Datcom+ Linear Function Interpolation Data |
| lfm | Life Forms Studio Data |
| lfnt | ReadyNAS Remote Folder Shortcut |
| lfp | IPRO LFP Data |
| Life Forms Studio Palette Data |
| lfq | LeechFTP Saved Queue |
| lfs | Samsung Android Phone LFS File |
| lfv | Labassert Functional View Library |
| lfview | Leapfrog Viewer Scene |
| lg | Progress OpenEdge Database Log |
| lg0 | IBM Tivoli Monitoring Log |
| lg1 | IBM Tivoli Storage Manager Log Backup |
| Microsoft Message Queuing Log |
| OptionVue Portfolio Manager LGN Backup |
| ScadaWorks ScadaBuilder Log |
| lg2 | HotMux Thermocouple Data Log |
| Microsoft Message Queuing Log |
| OptionVue Portfolio Manager LGN Backup |
| ScadaWorks ScadaBuilder Log |
| lg3 | OptionVue Portfolio Manager LGN Backup |
| lgb | Intuit QuickBooks Encrypted Login Data |
| PC LogBook Data |
| lgc | Corel WordPerfect DTD Compiler Logic Data |
| Logicator Data |
| Microsoft Windows Application Log |
| Screen Saver Toolkit Data |
| SimpleK Database |
| lgd | Autodesk Simulation Mechanical DDAM Statistics Data |
| Microsoft Windows Application Log |
| lge | BallStat League Data |
| lgen | PLINK Long-format Genotype File |
| lgf | LeechGet FTP Queue |
