| ncd | PTC Creo CL Syntax Alias Data |
| ncd | Xilinx ISE Native Circuit Description |
| ncdb | NoteCase Pro Database |
| ncde | NoteCase Pro Encrypted Database |
| ncer | Nitro Cell Resource |
| ncf | GibbsCAM CNC Program Listing |
| ncf | Lotus Notes Internal Clipboard Data |
| ncf | Xilinx Platform Studio Netlist Constraints File |
| ncg | Netomata Config Generator Template |
| ncgr | Nitro Character Graphic Resource |
| nch | Microsoft Outlook Express Folder Data |
| nci | Mastercam NCI Lines Data |
| nck | PTC Creo NC Check Image Data |
| ncks2 | NI Traktor Kontrol S2 Template |
| ncks4 | NI Traktor S4 Template |
| ncks5 | NI Traktor S5 Template |
| nckx1 | NI Traktor Kontrol X1 Template |
| ncl | PTC Creo CL Data |
| nclr | Nitro Colour Resource |
| ncn | Netcad Point Data |
| nco | Nero BackItUp Compressed Data |
| ncomp | SAM Dirichlet Mixture Prior Library |
| ncp | Nikon Picture Control |
| ncp | SmartWare Communication Profile Data |
| ncs | Lotus Notes Content Source |
| ncs | NeuraLynx Single Continuous Channel Data |
| ncsa | Hierarchical Data Format File |
| ncss | NCSS Dataset File |
| nc_ | Nero BackItUp Child File |
| nda | Nero BackItUp Drive Image |
