| Extension | File Description |
| .NC | CAD Files |
| .NC0 | Uncommon Files |
| .NC1 | Uncommon Files |
| .NC2 | Uncommon Files |
| .NC3 | Uncommon Files |
| .NC4 | Uncommon Files |
| .NC5 | Uncommon Files |
| .NC6 | Uncommon Files |
| .NC7 | Uncommon Files |
| .NC8 | Uncommon Files |
| .NC9 | Uncommon Files |
| .NCA | Uncommon Files |
| .NCB | Developer Files |
| .NCC | Uncommon Files |
| .NCD | Raster Image Files |
| .NCE | Uncommon Files |
| .NCF | Game Files |
| .NCG | Uncommon Files |
| .NCH | Misc Files |
| .NCI | Uncommon Files |
| .NCJ | Uncommon Files |
| .NCK | Uncommon Files |
| .NCL | Uncommon Files |
| .NCM | Uncommon Files |
| .NCN | Uncommon Files |
| .NCO | Backup Files |
| .NCP | Uncommon Files |
| .NCQ | Uncommon Files |
| .NCR | Raster Image Files |
| .NCS | Uncommon Files |
| .NCSA | Uncommon Files |
| .NCT | Raster Image Files |
| .NCU | Uncommon Files |
| .NCV | Uncommon Files |
| .NCW | Uncommon Files |
| .NCX | Misc Files |
| .NCY | Uncommon Files |
| .NCZ | Uncommon Files |
| .ND0 | Uncommon Files |
| .ND1 | Uncommon Files |
| .ND2 | Uncommon Files |
| .ND3 | Uncommon Files |
| .ND4 | Uncommon Files |
| .ND5 | Uncommon Files |
| .ND6 | Uncommon Files |
| .ND7 | Uncommon Files |
| .ND8 | Uncommon Files |
| .ND9 | Uncommon Files |
| .NDA | Uncommon Files |
| .NDAS | Uncommon Files |
| .NDB | Data Files |
| .NDC | Settings Files |
| .NDCT | Uncommon Files |
| .NDD | Uncommon Files |
| .NDE | Uncommon Files |
| .NDF | Database Files |
| .NDG | Uncommon Files |
| .NDH | Uncommon Files |
| .NDI | Uncommon Files |
| .NDJ | Uncommon Files |
| .NDK | Data Files |
| .NDL | Misc Files |
| .NDM | Uncommon Files |
| .NDN | Uncommon Files |
| .NDO | Uncommon Files |
| .NDP | Uncommon Files |
| .NDQ | Uncommon Files |
| .NDR | Uncommon Files |
| .NDS | Game Files |
| .NDT | Uncommon Files |
| .NDU | Uncommon Files |
| .NDV | Uncommon Files |
| .NDW | Uncommon Files |
| .NDX | Data Files |
| .NDY | Uncommon Files |
| Extension | File Description |
| .NDZ | Uncommon Files |
| .NE0 | Uncommon Files |
| .NE1 | Uncommon Files |
| .NE2 | Uncommon Files |
| .NE3 | Uncommon Files |
| .NE4 | Uncommon Files |
| .NE5 | Uncommon Files |
| .NE6 | Uncommon Files |
| .NE7 | Uncommon Files |
| .NE8 | Uncommon Files |
| .NE9 | Uncommon Files |
| .NEA | Uncommon Files |
| .NEB | Uncommon Files |
| .NEBULA | Uncommon Files |
| .NEBULOS | Uncommon Files |
| .NEC | Uncommon Files |
| .NED | Developer Files |
| .NEE | Uncommon Files |
| .NEEDS | Uncommon Files |
| .NEF | Raster Image Files |
| .NEG | Uncommon Files |
| .NEGPOS | Uncommon Files |
| .NEH | Uncommon Files |
| .NEI | Uncommon Files |
| .NEJ | Uncommon Files |
| .NEK | Uncommon Files |
| .NEL | Uncommon Files |
| .NEM | Uncommon Files |
| .NEN | Uncommon Files |
| .NEO | Raster Image Files |
| .NEO40SFONT | Uncommon Files |
| .NEP | Uncommon Files |
| .NEPPRJ | Uncommon Files |
| .NEQ | Uncommon Files |
| .NER | Uncommon Files |
| .NES | Game Files |
| .NET | Data Files |
| .NETA | Data Files |
| .NETCDF | Uncommon Files |
| .NETMODULE | Uncommon Files |
| .NEU | CAD Files |
| .NEUALL2 | Uncommon Files |
| .NEUCHEAT1 | Uncommon Files |
| .NEV | Uncommon Files |
| .NEW | Uncommon Files |
| .NEWFONT | Uncommon Files |
| .NEWORDER | Uncommon Files |
| .NEWPLR | Uncommon Files |
| .NEWS | Uncommon Files |
| .NEWSLETTER | Uncommon Files |
| .NEWTECH | Uncommon Files |
| .NEX | Uncommon Files |
| .NEXTURN | Uncommon Files |
| .NEY | Uncommon Files |
| .NEZ | Uncommon Files |
| .NF | Uncommon Files |
| .NF0 | Uncommon Files |
| .NF1 | Uncommon Files |
| .NF2 | Uncommon Files |
| .NF3 | Uncommon Files |
| .NF4 | Uncommon Files |
| .NF5 | Uncommon Files |
| .NF6 | Uncommon Files |
| .NF7 | Uncommon Files |
| .NF8 | Uncommon Files |
| .NF9 | Uncommon Files |
| .NFA | Uncommon Files |
| .NFB | Backup Files |
| .NFC | Backup Files |
| .NFD | Uncommon Files |
| .NFE | Uncommon Files |
| .NFF | 3D Image Files |
| .NFG | Uncommon Files |
| .NFH | Uncommon Files |
| .NFI | Disk Image Files |
