| ndb | ClamAV Extended Signature Data |
| ndb | NEPLAN Network Node Data |
| ndc | Nick-O-Matic Design Factory Data |
| ndd | Nikon Capture Dynamic Exposure Extender |
| ndd | Nintendo 64DD Emulator ROM Image |
| ndf | Channel Data File |
| ndf | Microsoft SQL Server Secondary Database File |
| ndf | NeoPlanet Browser Data |
| ndf | NimbleGen Design Data |
| ndi | Novell Netware Device Information File |
| ndjson | Newline Delimited JSON Data |
| ndk | Lotus Notes Design Elements |
| ndl | Lotus Notes Data Link |
| ndl | Nick-O-Matic Design Factory NDL Data |
| ndm | Navicat for MySQL DataModels Data |
| ndp | NET Deed Plotter File |
| ndpa | Hamamatsu NanoZoomer Annotation Data |
| ndpr | Hamamatsu NanoZoomer Digital Pathology Image Format Data |
| ndpvs | Hamamatsu NanoZoomer Script |
| ndr | Nikon Capture Image Dust Off File |
| ndr | Rave Reports Report Data |
| nds | Nero Burning ROM DiscSpan Compilation |
| nds | Nick-O-Matic Design Factory NDS Data |
| nds | Nintendo DS ROM Image |
| ndt | Niton Data Transfer File |
| ndu | SymbianOS Backup Data |
| ndv | ENVI N-D Visualizer State Data |
| ndv | Nanodrop Spectrophotometer Report |
| ndv | SmartWare Network Driver |
| ndx | ArcView Fonts Index Data |
| ndx | Aston-Tate dBASE Database Index |
| ndx | Concordance Numeric Data and Text Fields Data |
| ndx | EPM Keyword Index |
| ndx | Neat 5 Exported Archive |
| nearest | PLINK Nearest Neighbor Distance Report Data |
| neb | Nord Electro 3 Factory Backup |
| nec | NEC Antenna Data |
| ned | Navicat for MySQL ER Diagram Data |
| nef | Nero BackItUp Encryption File |
| negpos | ColorNeg Film Description |
| nei | LonWorks Neuron EPROM Image File |
| neon | NEON Encoded Data |
| nepg | Nord Electro 3 Program |
| neroserial | Nero Multimedia Suite License Key |
| nes | NES ROM Image |
| nes | Nessus Script |
| nessus | Nessus Network Security Scanner |
| net | Cadence OrCAD Netlist Output Data |
| net | CIRCAD Netlist Data |
| net | Dynagen Network Topology Data |
| net | EPANET Data |
| net | FileMaker Pro Networking Module |
| net | KiCad Netlist Data |
| net | PTV VISUM Network Data |
| net | SNNS Network Definition Data |
| neta | Netica Binary Data |
| netspm | NetSpot Map |
| neu | Altair FEKO Femap Geometrical Data |
| neu | GAMBIT NEU Data |
| nev | NeuraLynx Event Information Data |
| newsloc | Mac OS X Finder News Location Data |
| nex | NeuroExplorer Data |
| nex | NEXUS Data File |
| nf | The Bro NetFlow Data |
| nf2 | NeverForget v2 Data |
| nfa | Netflix for Android Data |
| nfb | Nokia Phone Backup |
| nfd | Altair FEKO Near Field Data Input |
| nfd_data | Nero Multimedia Suite Data |
| nfe | Nikon Capture Fisheye Lens Data |
| nfg | Gambit Strategic Game Format File |
| nfg | NewsBin Pro Configuration |
| nfi | Netflix Downloaded Information |
| nfl | Autodesk AutoCAD Multiline Filter Data |
| nfn | NoteFly Note Data |
| nfr | CONTAM Node Flow Results Data |
| nfslicense | netfabb Basic License Key |
| nfy | IBM DB2 Administration Notification Log |
| nfz | JB BAHN Vehicle Data |
| nga | ngPlant Model Archive |
| ngc | NeoGeo Pocket Color ROM Image |
| ngc | Xilinx Platform Studio Generated Netlist |
| ngd | NimbleGen Gene Description Data |
| ngd | Xilinx ISE Native Generic Database |
| nge | neXus Personal Security Client Data |
| ngf | NetSight Generated Format Data |
| ngh | MODELLER Residue Neighbors Data |
| ngm | Xilinx ISE Map Intermediate Data |
| ngo | numberGo Dynamic Report |
| ngp | NeoGeo Pocket ROM Image |
| ngp | ngPlant Model Data |
| ngr | Nokia PC Suite Install Archive |
| ngrr | Guitar Rig User Presets |
| ngs | Horiba LabSpec NGS Data |
| ngs | NGSSniff Data |
| ngw | NGRAIN 3D Data |
| nha | Native Noah Format Data |
| nhb | No Hands Backup Backup Description |
| nhcode | Mastercam NetHASP Code |
| nhd | Nero Burning ROM AVHCD Compilation |
| nhd | NetHelpDesk Page Data |
| nhdr | Nearly Raw Raster Header Data |
| nhm | Microsoft SMS NHM Data |
| nhp | NOAA Hydrophone Data |
| nhr | BLAST Header Data |
| nhx | New Hampshire eXtended Format Data |
| nia | Nikon Capture Image Adjustment Data |
| nib | Adobe AIR NIB Data |
| nick | Microsoft Outlook 2000 Auto Complete Nick List |
| nicrash | NI Traktor Crash Data |
| nid | Nikon Capture IPTC Data |
| nif | Gamebryo Model Data |
| nif | NetShift Interface Format Data |
| nifcache | Gamebryo NIF Cache |
| nii | NIfTI-1 Data Format File |
| nil | Norton Icon Library File |
| nil | QIP NIL Data |
| nin | BLAST Nucleotide Database |
| nir | FOSS NIR Spectrophotometers Data |
| niv | theWord New International Version Module |
| nix | IBM Rational XDE Node Instance File |
| nj | MOLPHY Neighbor Joining Phylogeny Data |
| nja | Seifert XRD ASCII Pole Figures Data |
| njb | Nikon Photo Index |
| njc | Seifert XRD Pole Figures Data |
| njf | Lotus Notes Job Data |
| nji | Nero BackItUp Job Information |
| njob | NDARC Job Data |
| njt | Nero BackItUp Job Template |
| nk2 | Microsoft Outlook 2002 Auto Complete Nick List |
| nka | NI Abbey Road Drummer Data |
| nkd | Nikon ViewNX Thumbnail Cache |
| nkfn | Kernel for NTFS Data Recovery Snapshot Data |
| nkg | Native Instruments Kontakt Groups |
| nkjv | theWord New King James Version Module |
| nksc | Nikon Capture NX-D Sidecar Data |
| nksf | Native Kontrol Standard Presets Library |
| nksn | Native Instruments Kontakt Settings |
| nksr | NI REAKTOR Rack Data |
| nkt | nKPRO Telemetry Data |
| nktrl2_data | Korg nanoKontrol2 Settings Data |
| nktrl_data | Korg Kontrol Editor Scene Data |
| nkv | PLDA Shared Model |
| nky | NUMROTO Keyfile |
| nl | AMPL NL Problem File |
| nl | Natron Layout Data |
| nl | newlook Screen Data |
| nl | Norton Desktop Icon Library |
| nl | NoteLedge Data |
| nl2 | eSignal Market Depth Data |
| nlang3 | Ashampoo Internet Accelerator Localisation Data |
| nlb | MyDraw Binary Library |
| nlb | Oracle Locale Builder Binary File |
| nlc | Nero Linux Compilation |
| nld | Norland Image Format File |
| nlf | ClickTracks Normalized Log File |
| 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 |
| nlx | MyDraw XML Library |
| nly | CBS CheckWriter NonCalc Layout |
| nm | RM Number Magic Document |
| nm | Space Engine Nebula Model Data |
| nm2 | Navitel v3 Map |
| nm3 | DNMR3 Input Data |
| nm3 | Navitel v5 Map |
| nm7 | Navitel Navigator v7 Map |
| nmat | NeoEngine Material Data |
| nmb | Samba NetBIOS Name Server Log |
| nmbd | Samba NetBIOS Name Server Log |
| nmdar | Connectivity Memory Model NMDA Input Data |
| nmdb | NoiseMap Database |
| nmf | Lightwave 3D Normal Map |
| nmi | SwordSearcher Data |
| nmig | Noah System 3 Database |
| nml | NEURO ONE Static Neuron Model |
| nml | News Markup Language Data |
| nmm | Nightmare Module |
| nmmm | Samsung Note Data |
| nmo | 3DVIA Virtools Behavioral Object |
| nmp | Nikon E-Max Data |
| nmpd | Navicat for MariaDB Data Synchronization Data |
| nmpj | Navicat for MariaDB batch job |
| nmps | Navicat for MariaDB Structure Synchronization Data |
| nmpt | Navicat for MariaDB Transfer Data |
| nmr | NUTS NMR Data |
| nms | 3DVIA Virtools Graphical Script |
| nmsv | Ableton Live Massive Plugin Preset |
| nmu | Debian Non-maintainer Upload |
| nmu | EMC Documentum Client Library Query Cache |
| nmu | Silvaco TCAD Simulation Standard Data |
| nmx | NI Traktor Mix Data |
| nna | NeuralWare NeuralWorks Data |
| nnb | ANNI Neural Network Batch |
| nnd | CYMFLOW Network Data |
| nnes | Nostalgia.NES Saved Game |
| nnf | Cytoscape Nested Network Format File |
| nni | ANNI Neural Network Investing |
| nnl | Network Notepad Professional License |
| nnp | ANNI Neural Network Portfolio |
| nnr | NeuralWare NeuralWorks Data |
| nns | NobleNet Sealer File |
| nnt | Eudora Addressbook Database |
| nntp | NewsWatcher NNTP Data |
| nnvs | NextNine VNC Player Session Data |
| nnw | NobleNet Web Data |
| nob | Chart Navigator Pro Navigation Objects Data |
| nod | MSC Patran Nodal Results |
| nodes | PowerFolder Nodes Data |
| nog | BLAST NOG Data |
| nom | PC-DMIS NOM File |
| noname | Google Photos Empty File |
| nop | Nikon Optional Picture Control |
| nopd | Navicat for Oracle Data Synchronization Profile Data |
| nope | Navicat for Oracle Exported Table |
| nopem | Navicat for Oracle Export Materialized View Profile |
| nopeq | Navicat for Oracle Export Query Result Profile Data |
| nopev | Navicat for Oracle Export View Result Profile Data |
| nopi | Navicat for Oracle Import Wizard Profile Data |
| nopj | Navicat for Oracle Batch Job |
| nops | Navicat for Oracle Structure Synchronization Data |
| nopt | Navicat for Oracle Data Transfer Profile Data |
| not | Adobe InCopy User Dictionary |
| not | MakeMusic Finale Note File |
| not | Zemax Element Drawing Note |
| note | Corel WordPerfect for Mac Help Data |
| note | Notability Note Data |
| notx | E-Sword v9 Study Note |
| notz | FiiNote Exported Note |
| nou | Numerical Electromagnetics Code Output |
| nov | Native Instruments Battery Data |
| novafold | NovaFold Format Data |
| novs | Novell NetWare Control Center Data |
| nox | Wave IRIS NOx Data |
| noy | NOY Backup Data |
| nozskin | WinDS PRO NOZSkin Data |