| Endung | Registry-Eintrag | Anwendung (Standard) |
| .ncd | Nero Cover Designer.Document | Nero Burning ROM |
| .ncs | ncsdatei | |
| .nct | Nero Cover Designer.Template | Nero Burning ROM |
| .net | FMPro50NET | FileMaker Pro |
| .nfo | MSInfo.Document | |
| .nhf | NeroHFSType | Nero Burning ROM |
| .NMW | T126_Whiteboard | |
| .nr3 | NeroMP3Type | Nero Burning ROM |
| .nra | NeroAudioType | Nero Burning ROM |
| .nrb | NeroCDROMBootType | Nero Burning ROM |
| .nrc | NeroUDFISOType | Nero Burning ROM |
| .nrd | NeroDVDVideoType | Nero Burning ROM |
| .nre | NeroCDExtraType | Nero Burning ROM |
| .nrg | NeroImageType | Nero Burning ROM |
| .nrh | NeroCDROMHybridType | Nero Burning ROM |
| .nri | NeroCDROMType | Nero Burning ROM |
| .nrm | NeroMixedModeType | Nero Burning ROM |
| .nru | NeroUDFType | Nero Burning ROM |
| .nrv | NeroVideoType | Nero Burning ROM |
| .nrw | NeroWMAType | Nero Burning ROM |
| .nsf | Notes Storage Facility | Lotus Notes |
| .ntf | Notes Template File | Lotus Notes |
| .nvr | text | MICROSOFT Notepad |
| .nws | Microsoft Internet News Message | MICROSOFT Outlook |
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