| lnk | Windows Shortcut |
| lnk2 | Program Neighborhood Explorer Shortcut |
| lock | General Program Lock File |
| lockfile | Mac OS X PLIST Lock |
| lock_sync | Mac OS X Synchronization Lock |
| log1 | Windows Registry Hive Log |
| log2 | Windows Registry Hive Log |
| low | PDP-10 Program Low Segment |
| lpd | Lookout Protocol Driver |
| lrd | Microsoft Money Lock File |
| lrlib | Adobe Photoshop Lightroom Library |
| lrlibrary | Adobe Photoshop Lightroom Library |
| lrmodule | Adobe Photoshop Lightroom Module |
| lst | General List File |
| ltkey | LeaderTask License Key |
| lut | Lutron Q-Admin Project Backup |
| lva | Logitech Video Effects Avatar |
| lvf | Logitech Video Effects |
| lwz | Lightwave 3D Plugin |
| lxr | MicroVigene License Request File |
| m3k | Interactive Digital Content |
| m3p | Mach3 Plugin |
| magnet | Magnet Link Data |
| mailplanelicense | Mailplane License Data |
| mapimail | Windows Mail Recipient Shortcut |
| mbam | Malwarebytes Anti-Malware Script |
| mbz | PogoShell NES Emulator Plugin |
| mci | Media Control Interface Data |
| mcl | Windows Media Center Link |
| mcq | McAfee Antivirus Quarantined Data |
| mcr | ePSXe Memory Card Image |
| mcrp | MobyExplorer Encrypted File |
| mdf | Fldigi Macro |
| mer | RSView Development Runtime |
| merlinlicense | Merlin Project License Data |
| metadata_never_index | Spotlight Never Index |
| mfa | MobileFrame Application |
| mflink | M-Files Desktop Shortcut |
| mft | Multitude FireTalk Web Launcher Plugin |
| mhtenx | Egis Encrypted Data |
| mi | Oracle AutoVue Graphic Plugin |
| mi4 | Audio Player Firmware |
| mism | FlasKMPEG Mpeg Input Stream Module |
| mjt | Macro Scheduler Compiled Macro |
| mkey | CompeGPS Land Registration Key Data |
| mkeyb | CompeGPS Land Registration Key Data |
| mlid | Novell Netware Multiple Link Interface Driver |
| mll | Autodesk Maya Plugin |
| mmbas | MindManager Macro |
| module | Drupal Module File |
| monitor | HP Printer Utility for Mac Monitor Plugin |
| mp1 | MediaPortal 1 Extension |
| mpcpl | Media Player Classic Playlist |
| mpe1 | MediaPortal 1 Extension |
| mpqe | Blizzard Encrypted MoPaQ File |
| mscr | ServiceMon Script |
| mscript | Maperitive Map Script |
| mse | Autodesk 3D Studio MAX Encrypted MAXScript |
| msplg | Modem Spy Plugin |
| msrcincident | Microsoft Windows Remote Assistance Invitation |
| msu | Blaise Manipula Script |
| msux | Blaise Manipula Script |
| mt | MonkeyTalk Script |
| mtf | Motorola Phone Theme |
| mtz | MIUI Compressed Theme |
| mum | Microsoft Windows Update Package |
| mv_ | MAGIX Movie Edit Pro Project Backup |
| mwd | MyWorkDrive Client Shortcut |
| mwlic | MoneyWell License File |
| mxf | Max Collective |
| mxi | Macromedia Extension Information |
| mxp | Macromedia Extension Package |
| mxt | PWB Add-in |
| mxt3 | MobaXterm Packaged Plugins |
| mxx | Maxwell Render Extension |
| mydocs | Windows My Documents Shortcut |
| mzd | Mootzoid Plugin |
| mzip | Cisco IOS MZIP Compressed Image |
| n81 | Apple iOS Kernel Cache Data |
| nasl | Nessus Attack Scripting Language Script |
| nb2 | NewsBin Pro Unfinished Download |
| nbu | NetBiter webSCADA Firmware Update |
| nbx | Magellan MobileMapper CE Firmware Update |
| ncv | Nikon Capture Curve |
| nd5 | Renamed NDS |
| ndrv | Mac OS X System Driver |
| netboot | Linux netboot Script |
| netsh | Microsoft Windows Netsh Script |
| new | General New File |
| nex | Opera 15 Navigator Extension |
| nfi | Dreambox Firmware Image |
| nfs | Network File System Temporary |
| nkey | Novicorp WinToFlash License Key |
| nmt | Popcorn Hour A-300 NMT Package |
| nmz | Nelson Module Container |
| noindex | Mac OS X Spotlight NOINDEX FIle |
| nomedia | Android No Media File |
| np | Portfolio NetPublish File |
| npj | Navicat for MySQL Batch Job |
| npt | Portfolio NetPublish Template |
