| nap | Napster Secured Audio |
| nbs | Minecraft Note Block Studio Song |
| ncmm | NI Maschine Mikro Template |
| ncsflib | Nitro Composer Sound Format LIB |
| ncw | Native Instruments Kontakt Compressed Wave |
| nfm8 | Native Instruments KOMPLETE FM8 Sound Data |
| nicnt | Native Instruments Kontakt v5 Library |
| nist | HTK NIST SPHERE Data |
| nkb | Native Instruments Kontakt Audio Bank |
| nkc | Kontakt Library Data |
| nki | Native Instruments Kontakt Library |
| nkm | Native Instruments Kontakt Multi Library |
| nkr | Kontakt Resource Container |
| nks | Native Instruments Kontakt Monolith Container |
| nkx | Kontakt Monolith Container |
| nmsv | New Massive Sound |
| npno | Nord Piano Module |
| nrt | Nokia Phone Ringtone |
| ns2p | Nord Stage 2 Program |
| nsa | Nullsoft Streaming Audio |
| nsf | NES Audio Data |
| nsfe | Nintendo NES Audio with Enhanced Tags |
| nsla | Nero Video Audio Data |
| nsp | KayPentax CSL Audio |
| nst | Noise Tracker Music Module |
| ntn | NOTION Song |
| ntp | NovoTrade Packer Music |
| nus3bank | Super Smash Bros Nus3bank Audio Archive |
| nvf | Creative Labs NOMAD II Audio |
| nwc | NoteWorthy Composer Music |
| nwctxt | NoteWorthy Composer Text |
| nxt | NeXTSTEP Sound File |
| o01 | Typhoon OS Voice Data |
| obw | Superior Drummer Sound File |
| ocdf | OneClickDigital Audio Book |