| 21. | .class | application/java ◊ application/java-byte-code ◊ application/octet-stream ◊ application/x-java-class ◊ application/x-java.vm |
| 22. | .clp | application/x-msclip |
| 23. | .cmc | application/vnd.cosmocaller |
| 24. | .cmdf | chemical/x-cmdf |
| 25. | .cml | chemical/x-cml |
| 26. | .cmp | application/vnd.yellowriver-custom-menu |
| 27. | .cmx | application/x-cmx ◊ image/x-cmx |
| 28. | .cod | image/cis-cod |
| 29. | .com | text/plain ◊ application/octet-stream |
| 30. | .conf | text/plain |