| ch8 | CHIP-8 Program |
| ch8 | ZX-Paintbrush Character Data |
| cha | Adobe Photoshop Channel Settings |
| changedb | SQLite Changes Data |
| chapters | ChapterGrabber Chapters Data |
| char | Nintendo DS Character Tile Data |
| charmm | CHARMM Data |
| charset | Mac OS X Character Set Data |
| chatlog | Adium Chat Log |
| chb | CHMReader.NET Internal Data |
| chb | OLE DB Checkbook Data |
| chc | HCFR Colorimeter Data |
| chck | Microsoft Exchange Database Check Data |
| check | CASTEP Check Binary |
| chem | TI bqEASY Chemistry Data |
| chf | PCAnywhere Remote Control Data |
| chg | Quicken Online Data |
| chg | Windows Netlogon ChangeLog |
| chj | IBM SPSS Interview Cache |
| chk | DB/TextWorks Check Textbase Problem Report |
| chk | Epidata Defined Checks |
| chk | Gaussian Checkpoint File |
| chk | Saved File Fragment |
| chk | Sophos Anti-Virus Intercheck Data |
| chl | Chromeleon Channel Raw Data |
| chls | Charles Session Data |
| chlsj | Charles Proxy Recording Data |
| chm | ChemDraw Chemical Structure |
| chm | SWAT Soil Chemical Input Data |
| chml | Chameleon Studio Database |
