| cht | ZSNES Game Cheat |
| chv | ChView Interactive Star Map |
| chw | Compiled HTML Help Index |
| chx | AutoCAD Standards Check |
| chy | FileMaker Pro Data |
| ch_ | Compressed CHM File |
| ci | CitectSCADA Data |
| ci | iBlaze Case Information File |
| ci | Polyspace Preprocessed Code Data |
| cia | Nintendo 3DS CTR Importable Archive |
| cib | Concordance Imagebase File |
| cib | DIALux Luminaire Data |
| cid | coDiagnostiX User Defined Implant Data |
| cid | EL-CID Data |
| cie | CIE Color Information Data |
| cif | ColorImpact File |
| cif | Corel Ventura Publisher Information |
| cif | Crystallographic Information File |
| cif | PCAnywhere Caller Data |
| cih | Photron FASTCAM Camera Information Header |
| cii | Intergraph CAESAR II Data File |
| cik | CorelDRAW Graphics Custom Dual Tone Settings Data |
| cik | Norton CleanSweep Installation Log |
| cikernel | CIKernel Data |
| cil | Norton CleanSweep Installation Log |
| cilx | VAMT Computer Information List |
| cim | Cimplicity HMI Screen |
| cimrt | Cimplicity HMI Runtime Screen |
| cin | BSL Circular Integration Data |
| cin | Microsoft Cinemania Data |
| cin | OS/2 Warp Change Control Data |
| cin96lm | Microsoft Cinemania Data |
| cin96upd | Microsoft Cinemania Data |
| cio | SWAT Master Watershed Data |
| cip | CryptoBuddy Encrypted File |
