| cn | GenePattern Copy Number Data |
| cn | RMCProfile Nitrogen Carbon Neighbours Data |
| cn1 | CNR Modem Initialization Data |
| cnb | Pegasus Mail Noticeboard Message |
| cnc | QuickCAM Pro CNC Machine Tool Path |
| cndf | Compressed NDF File |
| cne | Ancora Conserved Noncoding Elements Data |
| cng | CryptoNG Encrypted File |
| cni | CWBench Data |
| cnivg | CadnaR Voxel Grid Data |
| cnj | Acharya Conjunct Data |
| cnm | NoteMap Outline Data |
| cnm | Pegasus Mail New Message |
| cnn | CNVkit Data |
| cno | TSP-INet Server Error Description Data |
| cnr | CRiSP Harvest Chinook Non-retention Data |
| cnr | Pegasus Mail Message Data |
| cnt | 602PC Suite Macro |
| cnt | ENVI PPI Count Data |
| cnt | IBM Rational Rose Contents Tab |
| cnu | iiV Lookup Script |
| cnv | FARSITE Optional Conversion Data |
| cnv | IBM DB2 Conversion Data |
| cnv | PLINK Segmental Copy Number Variant Data |
| cnv | Tekla Structures Conversion File |
| cnw | DSC Crossover Network Tuning Data |
| cnx | IBM Rational XDE Component Instance File |
| cnx | Pegasus Mail v3 Message Data |
| cnx | Trimble LM80 Data |
| co | Cobalt 3D Model |
