| N | Neko Bytecode File | Executable Files | 1 | 1 |
| N1 | Nuke Randomic Life Generator File | Data Files | 4 | 1 |
| N19 | Unknown File Type | Uncommon Files | 1 | 1 |
| N1E | OM2 OMALI NENA Encrypted Document Version 1 | Text Files | 1 | 1 |
| N2E | The Incredible Adventures Of Van Helsing Effects | Game Files | 1 | 1 |
| N2KM | Headshape Modding 3D Tool For 3D Studio Max Modding Data | 3D Image Files | 1 | 1 |
| N2P | Net2Phone Data |
Data Files
| 1 | 1 |
| N2PK | The Incredible Adventures Of Van Helsing Game Data File |
Game Files
| 1 | 1 |
| N2S | Nebula Skin | Settings Files | 1 | 1 |
| N3 | Notation3 Document |
Text Files
| 3 | 1 |
| N64 | Nintendo 64 Emulator ROM File |
Game Files
| 4 | 1 |
| NA2 | Netscape Address Book File | Web Files | 1 | 1 |
| NAB | Netscape Communicator Addressbook |
Uncommon Files
| 3 | 3 |
| NAD | Neighbourhood Algorithm |
Data Files
| 2 | 1 |
| NAF | TRAKTOR Service Data File |
Data Files
| 1 | 1 |
| NAI | WinINSTALL Data |
Data Files
| 1 | 1 |
| NAK | Older Version Audio File | Audio Files | 1 | 1 |
| NAL | Novell ZENworks Suite Network Delivered Application Shortcut File Format |
Data Files
| 2 | 2 |
| NAM | Aqua3D Network File |
Data Files
| 3 | 3 |
| NAMES | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| NAP | McAfee ePO Network Associates Package |
Data Files
| 4 | 4 |
| NAPLPS | North American Presentation Layer Protocol Syntax File | Vector Image Files | 1 | 1 |
| NAR | Nexon Game Archive |
Game Files
| 4 | 2 |
| NARC | Nintendo DS Archive File |
Game Files
| 3 | 1 |
| NAS | Nastran Input File |
Data Files
| 1 | 1 |
| NASL | Nessus Attack Scripting Language Key File |
Data Files
| 1 | 1 |
| NATVIS | Microsoft Visual Studio Text Data |
Data Files
| 1 | 1 |
| NAV | Id Tech 3 Bot Navigation File |
Game Files
| 4 | 2 |
| NAZ | Total Overdose Game Data File |
Game Files
| 1 | 1 |
| NB | Mathematica Notebook | Spreadsheet Files | 2 | 2 |
| NB0 | Device Boot Loader Image | System Files | 1 | 1 |
| NB7 | NovaBACKUP Output File | Backup Files | 1 | 1 |
| NBA | Nero BackItUp Archive |
Backup Files
| 1 | 1 |
| NBE | Nessus Report File |
Data Files
| 1 | 1 |
| NBF | Backup Now Archive |
Backup Files
| 2 | 2 |
| NBI | Nero BackItUp Information File |
3D Image Files
| 1 | 1 |
| NBK | SMART Notebook File |
Data Files
| 6 | 3 |
| NBM | NetBeans Module | Plugin Files | 1 | 1 |
| NBP | Mathematica Player Notebook File |
Data Files
| 3 | 2 |
| NBU | Nokia Phone Backup Copy File |
Backup Files
| 4 | 1 |
| NBZ | ArcSoft Total Media Backup & Record Backup File |
Backup Files
| 1 | 1 |
| NC | Mastercam Numerical Control File | CAD Files | 7 | 3 |
| NC1 | Mastercam Numerical Control File |
CAD Files
| 1 | 1 |
| NCB | Visual C++ IntelliSense Database | Developer Files | 3 | 3 |
| NCC | CamView 3D File |
Data Files
| 1 | 1 |
| NCD | Nero CoverDesigner File | Raster Image Files | 3 | 2 |
| NCE | NoteCase Pro Encrypted Document |
Data Files
| 2 | 2 |
| NCF | No Cache File |
Game Files
| 3 | 3 |
| NCG | Native Instruments Controller Editor Template |
Data Files
| 1 | 1 |
| NCH | On Hold Message/Music File |
Audio Files
| 1 | 1 |
| NCI | Mastercam Toolpath Data | Graphic Files | 1 | 1 |
| NCL | NCAR Command Language File |
Developer Files
| 1 | 1 |
| NCM | Nokia Communicator Configuration Message |
Settings Files
| 1 | 1 |
| NCO | Nero BackItUp File |
Backup Files
| 2 | 1 |
| NCP | Nikon Camera Photo Settings |
Settings Files
| 2 | 2 |
| NCP2 | Unknown File Type |
Uncommon Files
| 1 | 1 |
| NCR | NCR Image |
Raster Image Files
| 1 | 1 |
| NCT | Now Contact File |
Data Files
| 2 | 2 |
| NCV | Nikon Capture Curves File |
Graphic Files
| 1 | 1 |
| NCX | EPUB Navigation Control XML File | eBook Files | 4 | 1 |
| NCZ | Netcad Drawing |
CAD Files
| 2 | 2 |
| NDA | Nero Backup File |
Backup Files
| 1 | 1 |
| NDB | SeeYou Waypoint File |
Data Files
| 7 | 5 |
| NDC | Personal Communications Settings File |
Settings Files
| 1 | 1 |
| NDD | Nikon Capture Digital DEE Data |
Raster Image Files
| 1 | 1 |
| NDF | SQL Server Secondary Database File | Database Files | 3 | 3 |
| NDG | Nick-O-Matic Design Factory Project File |
Graphic Files
| 1 | 1 |
| NDJ | Unknown File Type |
Uncommon Files
| 1 | 1 |
| NDK | Lotus Notes Design Elements File |
Data Files
| 2 | 1 |
| NDL | Lotus Notes Doclink File |
Uncommon Files
| 1 | 1 |
| NDM | Navicat Data Modeler Database Model |
Data Files
| 2 | 1 |
| NDR | Nikon Capture Image Dust Off File |
Data Files
| 3 | 3 |
| NDS | Nintendo DS Game ROM |
Game Files
| 3 | 2 |
| NDT | NEPLAN External Program Import/ Export File |
Data Files
| 1 | 1 |
| NDV | ENVI N-D Visualizer State Data |
Data Files
| 3 | 3 |
| NDW | Allplan Engineering File |
3D Image Files
| 1 | 1 |
| NDX | dBASE Index File |
Data Files
| 3 | 2 |
| NDZ | Emulab Frisbee Disk Image | Disk Image Files | 1 | 1 |
| NE2 | OM2 OMALI NENA Document Version 2 |
Text Files
| 1 | 1 |
| NE3 | OM2 OMALI NENA Document |
Database Files
| 1 | 1 |
| NEBULA | Nebula Data |
Game Files
| 1 | 1 |
| NEC | NEC Antenna Data |
Data Files
| 1 | 1 |
| NED | OMNeT++ Network Description File |
Developer Files
| 2 | 2 |
| NEF | Nikon Electronic Format Camera RAW Image | Camera Raw Files | 13 | 2 |
| NEI NASTRAN BULK DATA FILE | NEi Nastran Bulk Data File |
System Files
| 1 | 1 |
| NEN | Nick-O-Matic Design Factory Project File |
Graphic Files
| 1 | 1 |
| NEO | NeoChrome Bitmap Image |
Raster Image Files
| 1 | 1 |
| NES | Nintendo (NES) ROM File |
Game Files
| 10 | 1 |
| NET | NetViz Project File |
Data Files
| 2 | 2 |
| NET0143338 | Unknown File Type |
Uncommon Files
| 1 | 1 |
| NETA | Netica Binary File |
Data Files
| 1 | 1 |
| NETCDF | Scientific Data NETwork Common Data Format |
Data Files
| 1 | 1 |
| NEU | Pro/ENGINEER Neutral File |
CAD Files
| 2 | 1 |
| NEX | Navigator Extension | Compressed Files | 3 | 3 |
| NF | CVIP NF_help File |
Data Files
| 1 | 1 |
| NF2 | NeverForget Data File |
Data Files
| 1 | 1 |
| NFB | Nokia Phone Backup File |
Backup Files
| 3 | 1 |
| NFC | Nokia Phone Backup Copy File |
Backup Files
| 4 | 1 |
| NFD | Nefsis Document |
Text Files
| 1 | 1 |
| NFF | Neutral File Format |
3D Image Files
| 1 | 1 |
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