| Extension | File Description |
| .NFJ | Uncommon Files |
| .NFK | Uncommon Files |
| .NFL | Data Files |
| .NFM | Developer Files |
| .NFN | Uncommon Files |
| .NFO | Text Files |
| .NFP | Uncommon Files |
| .NFQ | Uncommon Files |
| .NFR | Uncommon Files |
| .NFS | Uncommon Files |
| .NFT | Uncommon Files |
| .NFU | Uncommon Files |
| .NFV | Uncommon Files |
| .NFW | Uncommon Files |
| .NFX | Uncommon Files |
| .NFY | Uncommon Files |
| .NFZ | Uncommon Files |
| .NG | Uncommon Files |
| .NG0 | Uncommon Files |
| .NG1 | Uncommon Files |
| .NG2 | Uncommon Files |
| .NG3 | Uncommon Files |
| .NG4 | Uncommon Files |
| .NG5 | Uncommon Files |
| .NG6 | Uncommon Files |
| .NG7 | Uncommon Files |
| .NG8 | Uncommon Files |
| .NG9 | Uncommon Files |
| .NGA | Uncommon Files |
| .NGB | Uncommon Files |
| .NGC | Uncommon Files |
| .NGD | CAD Files |
| .NGDAT | Game Files |
| .NGE | Uncommon Files |
| .NGF | Uncommon Files |
| .ngfile | Uncommon Files |
| .NGG | Uncommon Files |
| .NGH | Uncommon Files |
| .NGI | Uncommon Files |
| .NGJ | Uncommon Files |
| .NGK | Uncommon Files |
| .NGL | Uncommon Files |
| .NGM | Uncommon Files |
| .NGN | Uncommon Files |
| .NGO | Uncommon Files |
| .NGP | Game Files |
| .NGQ | Uncommon Files |
| .NGR | Uncommon Files |
| .NGS | Uncommon Files |
| .NGT | Uncommon Files |
| .NGU | Uncommon Files |
| .NGV | Uncommon Files |
| .NGW | Uncommon Files |
| .NGX | Uncommon Files |
| .NGY | Uncommon Files |
| .NGZ | Uncommon Files |
| .NH | Uncommon Files |
| .NH0 | Uncommon Files |
| .NH1 | Uncommon Files |
| .NH2 | Uncommon Files |
| .NH3 | Uncommon Files |
| .NH4 | Uncommon Files |
| .NH5 | Uncommon Files |
| .NH6 | Uncommon Files |
| .NH7 | Uncommon Files |
| .NH8 | Uncommon Files |
| .NH9 | Uncommon Files |
| .NHA | Uncommon Files |
| .NHB | Uncommon Files |
| .NHC | Uncommon Files |
| .NHD | Uncommon Files |
| .NHE | Uncommon Files |
| .NHF | Uncommon Files |
| .NHG | Uncommon Files |
| .NHH | Uncommon Files |
| Extension | File Description |
| .NHI | Uncommon Files |
| .NHJ | Uncommon Files |
| .NHK | Uncommon Files |
| .NHL | Uncommon Files |
| .NHM | Uncommon Files |
| .NHN | Uncommon Files |
| .NHO | Uncommon Files |
| .NHP | Uncommon Files |
| .NHQ | Uncommon Files |
| .NHR | Uncommon Files |
| .NHS | Uncommon Files |
| .NHT | Uncommon Files |
| .NHU | Uncommon Files |
| .NHV | Uncommon Files |
| .NHW | Uncommon Files |
| .NHX | Uncommon Files |
| .NHY | Uncommon Files |
| .NHZ | Uncommon Files |
| .NI | Uncommon Files |
| .NI0 | Uncommon Files |
| .NI1 | Uncommon Files |
| .NI2 | Uncommon Files |
| .NI3 | Uncommon Files |
| .NI4 | Uncommon Files |
| .NI5 | Uncommon Files |
| .NI6 | Uncommon Files |
| .NI7 | Uncommon Files |
| .NI8 | Uncommon Files |
| .NI9 | Uncommon Files |
| .NIA | Uncommon Files |
| .NIB | Developer Files |
| .NIC | Uncommon Files |
| .NICHOLS | Uncommon Files |
| .NICK | Misc Files |
| .NICO | Uncommon Files |
| .NID | Uncommon Files |
| .NIE | Uncommon Files |
| .NIF | 3D Image Files |
| .NIFF | Uncommon Files |
| .NIG | Uncommon Files |
| .NIGHT | Uncommon Files |
| .NIGHTS | Uncommon Files |
| .NIH | Uncommon Files |
| .NII | Uncommon Files |
| .NIJ | Uncommon Files |
| .NIK | Uncommon Files |
| .NIL | Uncommon Files |
| .NIM | Uncommon Files |
| .NIN | Uncommon Files |
| .nindex | Uncommon Files |
| .NIO | Uncommon Files |
| .NIP | Uncommon Files |
| .NIQ | Uncommon Files |
| .NIR | Uncommon Files |
| .NIRVANA | Uncommon Files |
| .NIS | Uncommon Files |
| .NIT | Uncommon Files |
| .NITF | Data Files |
| .NIU | Uncommon Files |
| .NIV | Uncommon Files |
| .NIW | Uncommon Files |
| .NIX | Uncommon Files |
| .NIY | Uncommon Files |
| .NIZ | Uncommon Files |
| .NJ0 | Uncommon Files |
| .NJ1 | Uncommon Files |
| .NJ2 | Uncommon Files |
| .NJ3 | Uncommon Files |
| .NJ4 | Uncommon Files |
| .NJ5 | Uncommon Files |
| .NJ6 | Uncommon Files |
| .NJ7 | Uncommon Files |
| .NJ8 | Uncommon Files |
| .NJ9 | Uncommon Files |
| .NJA | Uncommon Files |
