| 1. | .naa | News alert advertising data (MSNBC) |
| 2. | .nab | Address Book (Netscape Navigator) ◊ Address Book (Novell GroupWare) ◊ News alert branding data (MSNBC) |
| 3. | .nac | News alert channel data (MSNBC) |
| 4. | .nal | News alert log file (MSNBC) |
| 5. | .nam | Name Space Modules (Novell NetWare) |
| 6. | .nan | Nanoscope files (Raw Grayscale) |
| 7. | .nap | Vector graphics (Naplps format) ◊ Video file (EnerGraphics) |
| 8. | .naplps | Vector graphics (North American Presentation Layer Protocol Syntax) |
| 9. | .nas | News alert settings (MSNBC) |
| 10. | .nb | Text document (Nota Bene) |
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