| Extension | File Description |
| .NN9 | Uncommon Files |
| .NNA | Uncommon Files |
| .NNB | Uncommon Files |
| .NNC | Uncommon Files |
| .NND | Data Files |
| .NNE | Uncommon Files |
| .NNF | Uncommon Files |
| .NNG | Uncommon Files |
| .NNH | Uncommon Files |
| .NNI | Data Files |
| .NNJ | Uncommon Files |
| .NNK | Uncommon Files |
| .NNL | Uncommon Files |
| .NNM | Uncommon Files |
| .NNN | Uncommon Files |
| .NNO | Uncommon Files |
| .NNP | Data Files |
| .NNQ | Uncommon Files |
| .NNR | Uncommon Files |
| .NNS | Settings Files |
| .NNT | Uncommon Files |
| .NNU | Uncommon Files |
| .NNV | Uncommon Files |
| .NNVS | Uncommon Files |
| .NNW | Data Files |
| .NNX | Uncommon Files |
| .NNY | Uncommon Files |
| .NNZ | Uncommon Files |
| .NO0 | Uncommon Files |
| .NO1 | Uncommon Files |
| .NO2 | Uncommon Files |
| .NO3 | Uncommon Files |
| .NO4 | Uncommon Files |
| .NO5 | Uncommon Files |
| .NO6 | Uncommon Files |
| .NO7 | Uncommon Files |
| .NO8 | Uncommon Files |
| .NO9 | Uncommon Files |
| .NOA | Uncommon Files |
| .NOB | Uncommon Files |
| .NOC | Uncommon Files |
| .NOD | Uncommon Files |
| .NOE | Uncommon Files |
| .NOF | Uncommon Files |
| .NOFIN | Uncommon Files |
| .NOG | Uncommon Files |
| .NOH | Uncommon Files |
| .NOI | Uncommon Files |
| .NOJ | Uncommon Files |
| .NOK | Uncommon Files |
| .NOKIA | Uncommon Files |
| .NOKTXT | Uncommon Files |
| .NOL | Uncommon Files |
| .NOM | Uncommon Files |
| .NOMFICHIER | Uncommon Files |
| .NON | Uncommon Files |
| .NOO | Uncommon Files |
| .NOP | Uncommon Files |
| .NOQ | Uncommon Files |
| .NOR | Uncommon Files |
| .NORMAL | Uncommon Files |
| .NORUN | Uncommon Files |
| .NOS | Uncommon Files |
| .NOT | Data Files |
| .NOTE | Uncommon Files |
| .NOTE91 | Uncommon Files |
| .NOTEBOOK | Data Files |
| .NOTEPAD | Uncommon Files |
| .NOTES | Text Files |
| .NOTESEQ | Uncommon Files |
| .NOTESYN | Uncommon Files |
| .NOTESYNTH | Uncommon Files |
| .NOTH | Uncommon Files |
| .NOTICE | Uncommon Files |
| .NOU | Uncommon Files |
| Extension | File Description |
| .NOV | Uncommon Files |
| .NOW | Text Files |
| .NOX | Uncommon Files |
| .NOY | Uncommon Files |
| .NOZ | Uncommon Files |
| .NP | Data Files |
| .NP0 | Uncommon Files |
| .NP1 | Uncommon Files |
| .NP2 | Uncommon Files |
| .NP3 | Uncommon Files |
| .NP4 | Uncommon Files |
| .NP5 | Uncommon Files |
| .NP6 | Uncommon Files |
| .NP7 | Uncommon Files |
| .NP8 | Uncommon Files |
| .NP9 | Uncommon Files |
| .NPA | Uncommon Files |
| .NPAC | Uncommon Files |
| .NPB | Uncommon Files |
| .NPC | Uncommon Files |
| .NPD | Uncommon Files |
| .NPDOC | Uncommon Files |
| .NPE | Uncommon Files |
| .NPEXT | Uncommon Files |
| .NPF | Backup Files |
| .NPG | Uncommon Files |
| .NPH | Uncommon Files |
| .NPI | Uncommon Files |
| .NPIMG | Uncommon Files |
| .NPJ | Uncommon Files |
| .NPJOB | Uncommon Files |
| .NPK | Uncommon Files |
| .NPL | CAD Files |
| .NPM | Uncommon Files |
| .NPN | Uncommon Files |
| .NPO | Uncommon Files |
| .NPP | Page Layout Files |
| .NPQ | Uncommon Files |
| .NPR | Uncommon Files |
| .NPS | Backup Files |
| .NPSEW | Uncommon Files |
| .NPT | Data Files |
| .NPU | Uncommon Files |
| .NPV | Uncommon Files |
| .NPW | Uncommon Files |
| .NPX | Data Files |
| .NPY | Uncommon Files |
| .NPZ | Uncommon Files |
| .NQ0 | Uncommon Files |
| .NQ1 | Uncommon Files |
| .NQ2 | Uncommon Files |
| .NQ3 | Uncommon Files |
| .NQ4 | Uncommon Files |
| .NQ5 | Uncommon Files |
| .NQ6 | Uncommon Files |
| .NQ7 | Uncommon Files |
| .NQ8 | Uncommon Files |
| .NQ9 | Uncommon Files |
| .NQA | Uncommon Files |
| .NQB | Uncommon Files |
| .NQC | Developer Files |
| .NQD | Uncommon Files |
| .NQE | Uncommon Files |
| .NQF | Uncommon Files |
| .NQG | Uncommon Files |
| .NQH | Uncommon Files |
| .NQI | Uncommon Files |
| .NQJ | Uncommon Files |
| .NQK | Uncommon Files |
| .NQL | Uncommon Files |
| .NQM | Uncommon Files |
| .NQN | Uncommon Files |
| .NQO | Uncommon Files |
| .NQP | Uncommon Files |
| .NQQ | Uncommon Files |
