| Extension | File Description |
| .C7Y | Uncommon Files |
| .C7Z | Uncommon Files |
| .C80 | Uncommon Files |
| .C81 | Uncommon Files |
| .C82 | Uncommon Files |
| .C83 | Uncommon Files |
| .C84 | Uncommon Files |
| .C85 | Uncommon Files |
| .C86 | Uncommon Files |
| .C87 | Uncommon Files |
| .C88 | Uncommon Files |
| .C89 | Uncommon Files |
| .C8A | Uncommon Files |
| .C8B | Uncommon Files |
| .C8C | Uncommon Files |
| .C8D | Uncommon Files |
| .C8E | Uncommon Files |
| .C8F | Uncommon Files |
| .C8G | Uncommon Files |
| .C8H | Uncommon Files |
| .C8I | Uncommon Files |
| .C8J | Uncommon Files |
| .C8K | Uncommon Files |
| .C8L | Uncommon Files |
| .C8M | Uncommon Files |
| .C8N | Uncommon Files |
| .C8O | Uncommon Files |
| .C8P | Uncommon Files |
| .C8Q | Uncommon Files |
| .C8R | Uncommon Files |
| .C8S | Uncommon Files |
| .C8T | Uncommon Files |
| .C8U | Uncommon Files |
| .C8V | Uncommon Files |
| .C8W | Uncommon Files |
| .C8X | Uncommon Files |
| .C8Y | Uncommon Files |
| .C8Z | Uncommon Files |
| .C9 | Uncommon Files |
| .C90 | Uncommon Files |
| .C91 | Uncommon Files |
| .C92 | Uncommon Files |
| .C93 | Uncommon Files |
| .C94 | Uncommon Files |
| .C95 | Uncommon Files |
| .C96 | Uncommon Files |
| .C97 | Uncommon Files |
| .C98 | Uncommon Files |
| .C99 | Uncommon Files |
| .C9A | Uncommon Files |
| .C9B | Uncommon Files |
| .C9C | Uncommon Files |
| .C9D | Uncommon Files |
| .C9E | Uncommon Files |
| .C9F | Uncommon Files |
| .C9G | Uncommon Files |
| .C9H | Uncommon Files |
| .C9I | Uncommon Files |
| .C9J | Uncommon Files |
| .C9K | Uncommon Files |
| .C9L | Uncommon Files |
| .C9M | Uncommon Files |
| .C9N | Uncommon Files |
| .C9O | Uncommon Files |
| .C9P | Uncommon Files |
| .C9Q | Uncommon Files |
| .C9R | Uncommon Files |
| .C9S | Uncommon Files |
| .C9T | Uncommon Files |
| .C9U | Uncommon Files |
| .C9V | Uncommon Files |
| .C9W | Uncommon Files |
| .C9X | Uncommon Files |
| .C9Y | Uncommon Files |
| .C9Z | Uncommon Files |
| Extension | File Description |
| .CA | Misc Files |
| .CA0 | Uncommon Files |
| .CA1 | Uncommon Files |
| .CA2 | Uncommon Files |
| .CA3 | Uncommon Files |
| .CA4 | Uncommon Files |
| .CA5 | Uncommon Files |
| .CA6 | Uncommon Files |
| .CA7 | Uncommon Files |
| .CA8 | Uncommon Files |
| .CA9 | Uncommon Files |
| .CAA | Uncommon Files |
| .CAB | System Files |
| .CAC | Uncommon Files |
| .CACHE | Misc Files |
| .CAD | CAD Files |
| .CADET | Uncommon Files |
| .CAE | Uncommon Files |
| .CAF | Data Files |
| .CAG | Vector Image Files |
| .CAH | Uncommon Files |
| .CAI | Uncommon Files |
| .CAISSE | Uncommon Files |
| .CAJ | Uncommon Files |
| .CAK | Uncommon Files |
| .CAKEWALKWI | Uncommon Files |
| .CAL | Page Layout Files |
| .CALC | Uncommon Files |
| .CALCULATOR | Uncommon Files |
| .CALENDAR19 | Uncommon Files |
| .CALL | Uncommon Files |
| .CALS | Raster Image Files |
| .CAM | CAD Files |
| .CAMP | Settings Files |
| .CAMPROJ | Video Files |
| .CAMREC | Video Files |
| .CAMS | Uncommon Files |
| .CAMSHR | Uncommon Files |
| .CAMTHTR | Uncommon Files |
| .CAN | Raster Image Files |
| .CAO | Uncommon Files |
| .CAP | Developer Files |
| .CAPITAL | Uncommon Files |
| .CAPROJ | Uncommon Files |
| .CAPS | Uncommon Files |
| .CAQ | Uncommon Files |
| .CAR | Developer Files |
| .CARAMBA | Uncommon Files |
| .CARD | Uncommon Files |
| .CARDS | Uncommon Files |
| .CAROL | Uncommon Files |
| .CAROLES | Uncommon Files |
| .CAS | Misc Files |
| .CAS4 | Uncommon Files |
| .CASCII | Uncommon Files |
| .CASE | Settings Files |
| .CASECONVER | Uncommon Files |
| .CASTLE | Uncommon Files |
| .CAT | System Files |
| .CATALOG | Uncommon Files |
| .CATANALYSI | Uncommon Files |
| .CATDRAWING | Uncommon Files |
| .CATEGORIES | Uncommon Files |
| .CATFCT | Uncommon Files |
| .CATMATERIA | Uncommon Files |
| .CATPART | CAD Files |
| .CATPROCESS | Uncommon Files |
| .CATPRODUCT | CAD Files |
| .CATSHAPE | Uncommon Files |
| .CATSWL | Uncommon Files |
| .CATSYSTEM | Uncommon Files |
| .CAU | Uncommon Files |
| .CAULDRON | Uncommon Files |
| .CAV | Uncommon Files |
| .CAVE | Uncommon Files |
