| Extension | File Type | Files scanned | Contributor |
| N | Neko bytecode | 3 | |
| N-GAGE | N-Gage 2.0 on-device installation | 24 | Stefano Panzeri |
| N2P/N2V | Nebula Program / Vector | 55 | |
| N3D | NorthCAD-3D Drawing (v8) | 11 | |
| N3M | Nokia 3D Map | 4 | |
| N64 | 64NET container | 2 | |
| NAB | Novell Groupwise Address Book | 13 | |
| NAC | NetActive Container | 28 | |
| NAM | FontLab Name mapping rule | 2 | |
| NAM | Newsletters And More document (v3.0) | 102 | |
| NANR | Nintendo Animation Resource | 2 | |
| NAP | NAPLPS graphics | 21 | |
| NAR | Nexon game archive | 2 | |
| NAR | Ukagaka Ghost | 16 | |
| NARC | Nintendo ARChive | 2 | |
| NAS | Nastran input data | 5 | |
| NAS | Studio Folio Corsage copressed palette archive | 7 | |
| NATVIS | Visual Studio Natvis visualization | 13 | |
| NATVIS | Visual Studio Natvis visualization (UTF-8) | 12 | |
| NAV | Star Wars Jedi Knight: Jedi Academy bot Navigation/routes info | 3 | |
| NB/NBP | Mathematica Notebook | 17 | |
| NB | Mathematica Notebook (headerless) | 11 | |
| NB | WordPerfect Notebook | 4 | |
| NBATTRS | NetBeans project Attributes | 7 | |
| NBF | NVIDIA Scene Graph binary | 17 | |
| NBI | Ahead Nero BackItUp file (v1.x) | 10 | |
| NBI | Legend text | 11 | |
| NBIB | PubMed Bibliographic citation info | 13 | |
| NBK | IBM Ink Manager Notebook | 5 | |
| NBK | WaveStar Notebook | 11 | |
| NBKT | Native Instruments BATTERY kit | 8 | |
| NBM | NetBeans Module | 8 | |
| NBS | Open Minecraft Note Block Studio Song (v4) | 19 | |
| NBU | Nokia phone BackUp | 6 | |
| NBZ | C64 NBZ disk image | 104 | |
| NC | Drishti Processed Volume (header) | 4 | |
| NC | NetCDF Network Common Data Form (v3 64-bit) | 6 | Joerg Jenderek |
| NC | Snapmaker Luban laser engraving G-code | 6 | |
| NC | mcrypt encrypted (v2.2) | 2 | |
| NC | mcrypt encrypted (v2.5) | 2 | |
| NCB | Microsoft C/C++ program database (generic) | 23 | |
| NCC | NI Controller Configuration | 12 | |
| NCC | Nokia PC Suite Content Copier file | 4 | |
| NCD | Nero CoverDesigner | 18 | Joystick |
| NCD | Norton Change Directory info | 4 | |
| NCER | Nintendo Cell Resource | 4 | |
| NCFT | NoiseCraft project | 30 | |
| NCGR | Nintendo Character Graphic Resource | 2 | |
| NCLR | Nintendo Colour Resource | 2 | |
| NCM | NI MASCHINE template | 25 | |
| NCM2 | NI MASCHINE MK2 template | 15 | |
| NCMM | NI MASCHINE MIKRO template | 4 | |
| NCMM2 | NI MASCHINE MIKRO MK2 template | 7 | |
| NCOR | Adobe Encore project | 4 | |
| NCP | Nikon Custom Picture Control | 27 | |
| NCS | KOTOR (Knight Of The Old Republic) compiled script | 6 | |
| NCSFLIB | NCSF Nitro Composer Sound Format rip | 9 | |
| NCT | Ahead Nero CoverDesigner Template | 16 | |
| NCX | Navigation Control file for XML | 10 | |
| ND2 | Nikon NIS-Elements ND2 image | 9 | |
| NDB | SeeYou Waypoint | 5 | |
| NDF | Channel Data File | 12 | |
| NDF | ESET Smart Security Quarantine Data | 26 | Ryan Jones |
| NDM | Enemy Territory: Quake Wars demo | 9 | |
| NDO | Nendo model | 2 | |
| NDPA | NanoZoomer Annotation | 5 | |
| NDPI | Hamamatsu NanoZoomer Digital Pathology Image | 11 | |
| NDPI | Hamamatsu NanoZoomer Digital Pathology Images Set | 4 | |
| NDR | Rave Report | 3 | |
| NDTX | MyDraw Template | 13 | |
| NDX | Chess Assistant comments index | 5 | |
| NDX | WINDEV HFSQL index | 202 | |
| NEC | NEC JIS encoded file | 3 | |
| NED | Nerdtracker II module | 55 | |
| NEF | Nikon raw image format (BE) | 5 | |
| NEF | Nikon raw image format (LE) | 11 | |
| NEO | Atari NeoChrome bitmap | 4 | |
| NEO | NEOchrome Master bitmap | 4 | |
| NEON | NEONnoir game data | 1 | |
| NEPPRJ | NEPLAN Project | 8 | |
| NES | Nintendo 3DS VC ROM | 5 | |
| NES | Nintendo Entertainment System ROM | 12 | |
| NEST | NesTracker module | 8 | |
| NET | Epanet data file | 6 | |
| NET | FreePCB Netlist | 6 | |
| NET | Impulse Tracker Network driver | 3 | |
| NET | KiCad EESchema Netlist | 30 | |
| NET | KiCad Netlist output | 8 | |
| NET | NetCracker Resource Inventory | 4 | |
| NET | Netlab project | 11 | |
| NET | SNNS network definition | 12 | |
| NEU | Gambit Neutral File format | 16 | |
| NEX/NXS | NEXUS format | 17 | |
| NEX | ZX Spectrum Next binary format (generic) | 9 | |
| NEX | ZX Spectrum Next binary format (v1.0) | 2 | |
| NEX | ZX Spectrum Next binary format (v1.1) | 5 | |
| NEX | ZX Spectrum Next binary format (v1.2) | 2 | |
| NEXE | Google NaCl Executable (x86) | 66 | |
| NF | Faase Paint-by-Numbers puzzle format | 31 | |
| NFC | Flipper NFC device | 677 | |
| NFC | Nokia PC Suite Content Copier file | 13 | |
| NFD | T98-Next Floppy Disk image (R0) | 2 | |
| NFD | T98-Next Floppy Disk image (R1) | 2 | |
| NFF | Haines NFF scene | 7 | |
| NFF | Haines NFF scene (with rem) | 6 | |
| NFF | Neutral ASCII File Format | 7 | |
| NFG | Gambit strategic N-player Game File Format | 52 | |
| NFM8 | Native Instruments FM8 patch | 390 | |
| NFO | Infobase (Folio) | 25 | |
| NFO | Infobase (NextPage) | 10 | |
| NFO | Infobase (Rocket Software) | 7 | |
| NFO | Kodi info | 7 | |
| NFO | Microsoft System Information | 22 | Joerg Jenderek |
| NFTR | Nintendo DS Font Type | 2 | |
| NFZ | JB BAHN vehicle | 7 | |
| NG | Expert Help hypertext | 2 | |
| NG | Norton Guide | 40 | Joerg Jenderek |
| NGB | NonoPocket nonogram | 9 | |
| NGC/NGP/NPC | NeoGeo game cartridge (var 1) | 13 | |
| NGC/NGP/NPC | NeoGeo game cartridge (var 2) | 5 | |
| NGC/NGD/NGM | Xilinx Netlist | 16 | |
| NGDAT | N-Gage Game Data | 4 | |
| NGG | Nokia Group Graphics bitmap | 31 | |
| NGRR | Native Instruments Guitar Rig 5 preset | 18 | |
| NGS | NGPocket savestate | 7 | |
| NHD | North Star Horizon Hard Disk image | 3 | |
| NHD | T98-Next harddisk image | 5 | |
| NIA | Naive Image format NIA animated bitmaps | 2 | |
| NIALL | Gniall strings data | 2 | |
| NIB | Apple Interface Builder NIB archive (XML) | 10 | |
| NIB | Apple Interface Builder NIB archive (binary) | 20 | |
| NIB | C64 NIB disk image | 12 | |
| NIC | NeoDesk icon (compressed) | 7 | |
| NID | Nice-Install Data | 6 | |
| NIE | Naive Image format NIE bitmap | 2 | |
| NIF | GameBryo file format | 3 | |
| NIF | NetImmerse file format | 6 | |
| NIF | Notation Interchange File Format | 28 | |
| NIF | OS/2 Network Information File | 54 | |
| NIF | OS/2 Network Information File (with rem) | 18 | |
| NII | NIfTI-1 data format (big endian) | 36 | |
| NII | NIfTI-1 data format (little endian) | 34 | |
| NII | NIfTI-2 data format (big endian) | 2 | |
| NII | NIfTI-2 data format (little endian) | 2 | |
| NII | Naive Image format NII animated bitmaps | 2 | |
| NITF/NTF | NITF National Imagery Transmission Format image (generic) | 9 | |
| NITF/NTF | NITF National Imagery Transmission Format image (v1.x) | 12 | |
| NITF/NTF | NITF National Imagery Transmission Format image (v2.x) | 13 | |
| NITRO_ARCHIVE | Nitro game data archive | 8 | |
| NJ | Ninja 3D Model (unpacked) | 2 | |
| NJA | Seifert ASCII pole figure format | 7 | |
| NJS | Nekojiru game data | 2 | |
| NK | Nuke script | 9 | |
| NK2 | Outlook Nickfile | 10 | |
| NKC | Elite - The New Kind saved commander/game | 3 | |
| NKLM | Nakalyne project | 10 | |
| NKM | Mario Kart DS track data | 2 | |
| NKPLE | Nuke script (encrypted) | 4 | |
| NKSC | Nikon Sidecar | 60 | Tyler Thorsted |
| NKTRL2_DATA | KORG nanoKONTROL2 Editor data | 8 | |
| NKTRL_SET | KORG Kontrol Editor Settings | 15 | |
| NL2PARK | NoLimits 2 Park | 5 | |
| NL2PKG | NoLimits 2 Package | 4 | |
| NL3 | Mapletown Network bitmap | 2 | |
| NLM | Netware Loadable Module | 8 | |
| NLM | Nokia Logo Manager bitmap | 23 | |
| NLQ | DOT_MAGIC! NLQ font | 3 | |
| NLQ | Daisy-Dot NLQ font | 2 | |
| NLT | Windows Transliteration | 7 | |
| NLTRACK | NoLimits Track | 6 | |
| NM2 | Navitel 3.1 Map | 4 | |
| NM7 | Navitel 7 Map | 11 | |
| NMASK | Npic Mask | 64 | |
| NMEA/NMA | NMEA GPS log data | 6 | |
| NMF | Nikon Movie File | 4 | |
| NMF | Normal Map | 4 | |
| NML | Traktor collection | 12 | |
| NMO | 3DVIA Virtools behavioral object | 2 | |
| NMS | NuMega Symbol format | 48 | |
| NMSV | Native Instruments Massive Sound | 29 | |
| NMV | Nintendulator movie capture | 4 | |
| NNB | LigPlot Non-Bonded contacts data | 4 | |
| NNT | Eudora Address Book | 3 | |
| NOA | Nancy Codec video | 4 | |
| NOD | FMail Node configuration | 2 | |
| NOL | Nokia Operator Logo bitmap | 22 | |
| NOP | PopNOP crunched data | 36 | |
| NOT | Eclipse Notes | 2 | |
| NOT | Terminate Smartnote | 4 | |
| NOTE | Handrite Note document | 2 | |
| NOTE | My Handwrite Note | 4 | |
| NOTE | Notability Note | 4 | |
| NOTEBOOK | SMART Notebook | 10 | |
| NOTECARD | Linden Notecard | 6 | |
| NOV | Battery 3 quick load sample data | 199 | |
| NPC | Norton Desktop for DOS Printer Configuration | 9 | |
| NPK | MikroTik RouterOS Upgrade Package | 16 | |
| NPK | NeoplePack format | 2 | |
| NPK | NetEase Games data Package | 11 | |
| NPL | NPS Image Editor Palette | 24 | |
| NPL | Xilinx Integrated Software Environment Project | 21 | |
| NPM | Corel Custom Natural Media Stroke | 23 | |
| NPM | Nokia Picture Message bitmap | 2 | |
| NPP | Art Explosion Publisher Pro document | 7 | |
| NPR | Nuendo Project | 12 | |
| NPS | Natron Node Preset | 5 | |
| NPS | NetBeans Profiler Snapshot | 3 | |
| NPSD | NPS Image Editor Document | 6 | |
| NPSS | NPS Image Editor Script | 7 | |
| NPW | nPassword DataBank (w/o password) | 6 | |
| NPX | NETPIC ASCII-encoded GIF | 34 | |
| NPY | NumPy data | 25 | |
| NPZ | Npic bitmap | 9 | |
| NPZ | NumPy compressed data archive format | 3 | |
| NQI | ESET Smart Security Quarantined file Information | 6 | Ryan Jones |
| NQI | NOD32 Quarantined file Information | 4 | |
| NR3 | Nero MP3 ISO Compilation | 14 | |
| NRA | Nero Audio-CD Compilation | 4 | |
| NRA | Nero Audio-CD Compilation (Unicode) | 5 | |
| NRG | Nero Burning ROM CD Image | 5 | THE LoW |
| NRG | Nero BurningROM CDImage (RAW Format) | 3 | THE LoW |
| NRI | Nero ISO Compilation | 11 | |
| NRI | Tricksteronline image | 2 | |
| NRKT | Native Instruments Reaktor sample | 88 | |
| NRM | Heath: The Unchosen Path game data archive | 2 | |
| NRO | Nintendo Switch executable | 224 | |
| NRRD | Nearly Raw Raster Data | 7 | |
| NRV | Nero Video-CD compilation | 6 | |
| NRW | Nokia RAW bitmap | 2 | |
| NS1 | NetStumbler NS1 log | 5 | |
| NS2P | Nord Stage 2 Program | 6 | |
| NS2PB | Nord Stage 2 Program Bundle | 13 | |
| NSCR | Nintendo DS title Screen | 2 | |
| NSD | NSD audio | 2 | |
| NSF | Lotus Notes database | 23 | Massimo Nadalin |
| NSF | NATO Secondary Imagery Format | 40 | |
| NSF | NES Sound Format rip | 27 | |
| NSFE | Extended Nintendo Sound Format chiptune | 4 | |
| NSH | NetWars Shape | 4 | |
| NSI | NSIS script (with rem) | 35 | |
| NSI | NorthStar disk Image (NS DOS) | 9 | |
| NSK | NaShrinK compressed archive | 3 | |
| NSK | reFX NEXUS Skin | 17 | |
| NSL | Nokia Startup Logo Editor bitmap | 8 | |
| NSLA | Nero Scalable Audio | 8 | |
| NSMP | Nord User Sample | 14 | |
| NSP | Computerized Speech Lab NSP audio | 6 | |
| NSP | Nintendo Switch Submission Package | 75 | Masamune3210 |
| NSPG | Nord Stage Classic/EX Program | 7 | |
| NSS | NES Screen Tool Session (text) | 29 | |
| NST | Nestopia savestate | 13 | |
| NSV | Nullsoft Streaming Video | 8 | |
| NSX | Index Apollo Database Engine | 5 | Knuth Konrad |
| NSZ | Nintendo Switch Submission Zipped Package | 76 | Masamune3210 |
| NSZ | Rumble Fighter game data archive | 2 | |
| NT | NTitler show | 87 | |
| NT | Startrekker 1.x module info | 45 | |
| NT3 | JB BAHN layout | 24 | |
| NTB | Windows for Pen Computing Notebook | 3 | |
| NTF | Font descriptor | 5 | |
| NTF | National Transfer Format Map | 7 | |
| NTH | Nokia theme | 6 | |
| NTK | Newton Toolkit Project | 3 | |
| NTK | NoiseTrekker v1.0 module | 3 | |
| NTK | NoiseTrekker v2.0 module | 9 | |
| NTM | Navitel 2.0 Map | 35 | |
| NTP | NovoTrade Packer module | 15 | |
| NTP | Olitext Notes | 3 | |
| NTR | NETRUN ASCII-encoded COM/EXE | 15 | |
| NTRX | Notator-X Score | 3 | |
| NTSP | Sonic Frontiers textures | 2 | |
| NTT | Neato MediaFACE label template | 14 | |
| NTW | Lode Data Network | 4 | |
| NTX | Project Nomads Texture | 3 | |
| NTX | the Word Encrypted New Testament Text Module | 2 | |
| NULL | null bytes | 12 | |
| NUMBERS | Numbers spreadsheet | 13 | |
| NUNIT | NUnit project | 5 | |
| NUP | NOD32 Antivirus Update file | 143 | Ildar Ibatullin |
| NUPKG | NuGet Package | 15 | |
| NUSPEC | NuGet Specification | 16 | |
| NUSPEC | NuGet Specification (UTF-8) | 8 | |
| NUT | NUT Open Container Format | 6 | |
| NUT/SAN | Smush Animation format (old) | 6 | |
| NUV | NuppelVideo (MythTV) video | 4 | Ariel |
| NUV | NuppelVideo video | 4 | |
| NV | Juno address book | 10 | |
| NVB | NVIDIA Scene | 16 | |
| NVC | NeroVision Express project | 3 | |
| NVDL | NVDL script | 19 | |
| NVF | Creative Nomad II series MP3 players Voice File audio | 12 | |
| NVRAM | VMware BIOS state | 4 | |
| NW | CharlieCalc spreadsheet | 9 | |
| NW | GraalOnline level | 2 | |
| NW | NWiper show | 17 | |
| NWC | NoteWorthy Composer song | 12 | |
| NWC | NoteWorthy song (alternate format) | 18 | |
| NWC | Noteworthy Composer data file | 8 | Joachim Grabinski |
| NWD | NavisWorks Document | 10 | |
| NWF | Nero WaveEditor Audio File | 10 | Tyler Thorsted |
| NWP | Neo Content file | 11 | |
| NX1 | NexusDB database | 5 | |
| NX4/NXS/H4/HDF/HDF4/NEXUS | NeXus HDF4 data format | 19 | |
| NX5/NXS/H5/HDF/HDF5/NEXUS | NeXus HDF5 data format | 22 | |
| NXS/NXZ | Nexus 3D model | 2 | |
| NXV | NEXO NS-1 Venue | 398 | |
| NXV | NXV video | 4 | |
| NY | Audacity Nyquits plug-in | 21 | |
| NYF | myBase database | 5 | |
| NZ | NanoZip compressed archive | 4 | Label |
| NZ | NanoZip compressed archive (generic) | 26 | Label |
| NZB | Newzbin Usenet Index | 7 | |
