| nktrl_data | Korg Kontrol Editor Scene Data |
| nkv | PLDA Shared Model |
| nl | AMPL NL Problem File |
| nl | Natron Layout Data |
| nl | newlook Screen Data |
| nl2 | eSignal Market Depth Data |
| nlang3 | Ashampoo Internet Accelerator Localisation Data |
| nlb | Oracle Locale Builder Binary File |
| nlc | Nero Linux Compilation |
| nld | Norland Image Format File |
| nlf | ClickTracks Normalized Log File |
| nlf | MicroSim PCBoard Netlist |
| nlg | Nestopia Language Data |
| nlk | Microsoft Outlook 2003 E-mail Cookies Data |
| nll | newlook Batch Script |
| nlm | Novell NetWare Loadable Module |
| nlo | Lotus Notes Linked Object |
| nlogo | NetLogo Model |
| nlogo3d | NetLogo 3D Model |
| nlp | NirLauncher Package |
| nlpe | Navicat for SQLite Exported Table |
| nlpev | Navicat for SQLite Export View Result Profile |
| nlpj | Navicat for SQLite Batch Job |
| nlpt | Navicat for SQLite Data Transfer Profile |
| nlr | NLREG Nonlinear Regression Control Data |
| nls | National Language Support |
| nlt | Oracle Locale Builder Text File |
| nlu | Norton LiveUpdate E-mail Trigger Data |
| nlv | Nikon Capture LHC Editor File |
| nly | CBS CheckWriter NonCalc Layout |
