| nm5 | NovaMind 5 Mind Map Document |
| nmbtemplate | Numbers Spreadsheet Template |
| nmd | Nero MiniDVD Compilation |
| nmind | NovaMind 4 Mind Map Document |
| nms | Note-Mate Question Set |
| nmw | Netmeeting T126 Whiteboard Document |
| nof | NetObjects Fusion Document |
| not | E-Sword Notice |
| not | Veign Note-It Note |
| note | Plain Text Document |
| notebook | SMART Notebook Document |
| notes | Plain Text Document |
| now | Plain Text Document |
| npd | Netrosoft Presentation Document |
| npp | Art Explosion Publisher Pro Document |
| nr3 | Nero MP3 CD Compilation |
| nr4 | Nero AAC CD Compilation |
| nra | Nero Audio CD Compilation |
| nrb | Nero Boot CD-Rom Compilation |
| nrc | Nero UDF/ISO CD-Rom Compilation |
| nrd | Nero DVD-Video Compilation |
| nre | Nero CD Extra Compilation |
| nrh | Nero Hybrid CD-Rom Compilation |
| nri | Nero ISO9660 CD-Rom Compilation |
| nrm | Nero Mixed Mode CD Compilation |
| nrs | Nero CD-Rom (EFI Boot) Compilation |
| nru | Nero UDF CD-Rom Compilation |
| nrv | Nero VideoCD Compilation |
| nrw | Nero WMA CD-Rom Compilation |
| nsd | Nero Super VideoCD Compilation |
| nsln | NiceLabel Solution |
| nsr | NewsRoom Document |
| nt7 | Orchida Knitting System Pattern |
| nta | Nota Aspel Document |
| ntg | New Tool Geometry File |