| Endung | Registry-Eintrag | Anwendung (Standard) |
| .c | text | MICROSOFT Notepad |
| .c2d | ROXIO.CD.Image | ROXIO WinOnCD |
| .C4D | CINEMA 4D Document | CINEMA 4D |
| .cab | WinZip | Winzip |
| .cat | CATdatei | |
| .cda | audio | CD Player |
| .cdc | NeroCDCoverType | Nero Burning ROM |
| .cdf | Channeldatei |
MICROSOFT Internet Explorer
|
| .cdml | dateimakerdatei |
ADOBE GoLive
|
| .CDR | CorelDRAW.Graphic.10 | Corel DRAW |
| .CDT | CorelDraw.Graphic.10 | Corel DRAW |
| .cdx | aspdatei |
ADOBE GoLive
|
| .cer | CERdatei | |
| .cf | cfdatei | |
| .cfc | cfcdatei | |
| .CFG | CFG_auto_datei | |
| .cfm | ColdFusiondatei | Cold Fusion |
| .cfml | cfmldatei | |
| .cgi | cgi_auto_datei | |
| .cha | Photoshop.CHAdatei | ADOBE Photoshop |
| .chk | chkdatei | |
| .chm | chm.datei | |
| .chy | Claris.Hyphenation | Claris |
| .cil | ClipGalleryDownloadPackage | MICROSOFT Clip Gallery |
| .CLK | Corel R.A.V.E.Graphic.10 | Corel RAVE |
| .clp | clpdatei | |
| .clr | Flash.ColorTabledatei | Macromedia Flash |
| .cmd | cmddatei | |
| .CMX | CorelDRAW.CMX.10 | Corel DRAW |
| .cnf | ConferenceLink | |
| .col | COLdatei | |
| .com | comdatei | |
| .CPJ | ImgCut.Project | Image Cutter |
| .cpl | cpldatei | |
| .cpp | text | MICROSOFT Notepad |
| .cpt | CorelPhotoPaint.Image.10 | Corel PHOTOPAINT |
| .crt | CERdatei | |
| .cs | csdatei | |
| .CSB | CorelScript.Script.9.Bin | Corel SCRIPT |
| .CSC | CorelScript.Script.9 | Corel SCRIPT |
| .csf | Photoshop.ColorSettings | ADOBE Photoshop |
| .csh | Photoshop.CustomShapes | ADOBE Photoshop |
| .CSI | CorelScript.Script.9.Inc | Corel SCRIPT |
| .csp | Corel.SBProdatei | |
| .css | CascadingStyleSheetsdatei | |
| .css1 | CascadingStyleSheetsdatei | |
| .css2 | CascadingStyleSheetsdatei | |
| .csv | Excel | MICROSOFT Excel |
| .CTT | MessengerContactList | |
| .cue | Cue datei | Nero Burning ROM |
| .cur | curdatei | Cursor-Datei |
| .cwm | COASTWebMaster.SiteMap | COASTWebMaster |
| .cxx | text | MICROSOFT Notepad |
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