| cmv | PBD-14 Circumferential Mean Velocity Data |
| cmw | Custom Maintenance Wizard Data |
| cmxl | Microsoft Pivot Collection Data |
| cmy | CorelDRAW Custom CMY Data |
| cmz | Poser Compressed Camera Data |
| cn | GenePattern Copy Number Data |
| cn | RMCProfile Nitrogen Carbon Neighbours Data |
| cn1 | CNR Modem Initialization Data |
| cnarp | EULANDA ERP System Print Archive |
| cnb | Pegasus Mail Noticeboard Message |
| cnc | QuickCAM Pro CNC Machine Tool Path |
| cnd | Melco Condensed Embroidery Data |
| 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 |
| cnk | Microsoft Dynamics GP Chunk Data |
| cnlnk | EULANDA ERP System Link Data |
| cnm | Kerio WinRoute Firewall Mail Data |
| cnm | NoteMap Outline Data |
| cnm | Pegasus Mail New Message |
| cnmt | Nintendo Switch Content Metadata |
| cnn | CNVkit Data |
| cno | TSP-INet Server Error Description Data |
| cnr | CRiSP Harvest Chinook Non-retention Data |
| cnr | Pegasus Mail Message Data |
| cnrep | EULANDA ERP System Report Template |
| cnskn | EULANDA ERP System Skin Data |
