| The File Extension | Mime Type |
| .ctm File Extension | application/octet-stream |
| .ctx File Extension | application/ctx |
| .cwb File Extension | application/octet-stream |
| .cwk File Extension | application/clarisworks |
| .cwp File Extension | application/octet-stream |
| .cws File Extension | application/clarisworks |
| .cxt File Extension | application/octet-stream |
| .dap File Extension | application/vnd.ms-access |
| .des File Extension | application/octet-stream |
| .dft File Extension | application/octet-stream |
| .dgn File Extension | application/octet-stream |
| .dia File Extension | application/x-dia-diagram |
| .dif File Extension | application/x-dif |
| .diz File Extension | text/plain |
| .dnt File Extension | application/octet-stream |
| .doc File Extension | application/msword |
| .docm File Extension | application/vnd.openxmlformats |
| .docmhtml File Extension | text/html |
| .docx File Extension | application/vnd.openxmlformats |
| .dot File Extension | application/msword |
| .dotm File Extension | application/vnd.openxmlformats |
| .dotx File Extension | application/vnd.openxmlformats |
| .dqy File Extension | application/octet-stream |
| .drd File Extension | application/octet-stream |
| .drf File Extension | application/x-3ds |
| .dtp File Extension | application/octet-stream |
| .dwf File Extension | drawing/x-dwf |
| .dwfx File Extension | model/vnd.dwfx+xps |
| .dwg File Extension | application/x-autocad |
| .dwt File Extension | application/octet-stream |