| Extension | File Description |
| .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 |
| .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 |
| .CAC | Uncommon Files |
| .CADET | Uncommon Files |
| .CAE | Uncommon Files |
| .CAH | Uncommon Files |
| .CAI | Uncommon Files |
| .CAISSE | Uncommon Files |
| .CAJ | Uncommon Files |
| .CAK | Uncommon Files |
| .CAKEWALKWI | Uncommon Files |
| .CALC | Uncommon Files |
| .CALCULATOR | Uncommon Files |
| .CALENDAR19 | Uncommon Files |
| .CALL | Uncommon Files |
| .CAMS | Uncommon Files |
| .CAMSHR | Uncommon Files |
| .CAMTHTR | Uncommon Files |
| .CAO | Uncommon Files |
| .CAPITAL | Uncommon Files |
| .CAPROJ | Uncommon Files |
| .CAPS | Uncommon Files |
| .CAQ | Uncommon Files |
| .CARAMBA | Uncommon Files |
| .CARD | Uncommon Files |
| .CARDS | Uncommon Files |
| .CAROL | Uncommon Files |
| .CAROLES | Uncommon Files |
| .CAS4 | Uncommon Files |
| .CASCII | Uncommon Files |
| .CASECONVER | Uncommon Files |
| .CASTLE | Uncommon Files |
| .CATALOG | Uncommon Files |
| .CATANALYSI | Uncommon Files |
| .CATDRAWING | Uncommon Files |
| .CATEGORIES | Uncommon Files |
| .CATFCT | Uncommon Files |
| .CATMATERIA | Uncommon Files |
| .CATPROCESS | Uncommon Files |
| .CATSHAPE | Uncommon Files |
| .CATSWL | Uncommon Files |
| .CATSYSTEM | Uncommon Files |
| .CAU | Uncommon Files |
| .CAULDRON | Uncommon Files |
| .CAV | Uncommon Files |
| .CAVE | Uncommon Files |
| .CAW | Uncommon Files |
| .CAX | Uncommon Files |
| .CAY | Uncommon Files |
| .CAZ | Uncommon Files |
| .CA_ | Uncommon Files |
| .CB | Uncommon Files |
| .CB0 | Uncommon Files |
| .CB1 | Uncommon Files |
| .CB2 | Uncommon Files |
| Extension | File Description |
| .CB3 | Uncommon Files |
| .CB4 | Uncommon Files |
| .CB5 | Uncommon Files |
| .CB6 | Uncommon Files |
| .CB8 | Uncommon Files |
| .CB9 | Uncommon Files |
| .CBB | Uncommon Files |
| .CBC | Uncommon Files |
| .CBCP | Uncommon Files |
| .CBCX | Uncommon Files |
| .CBD | Uncommon Files |
| .CBE | Uncommon Files |
| .CBG | Uncommon Files |
| .CBH | Uncommon Files |
| .CBI | Uncommon Files |
| .CBIN | Uncommon Files |
| .CBJ | Uncommon Files |
| .CBLE | Uncommon Files |
| .CBM | Uncommon Files |
| .CBMV | Uncommon Files |
| .CBN | Uncommon Files |
| .CBO | Uncommon Files |
| .CBQ | Uncommon Files |
| .CBTX | Uncommon Files |
| .CBTZ | Uncommon Files |
| .CBV | Uncommon Files |
| .CBW | Uncommon Files |
| .CBX | Uncommon Files |
| .CBY | Uncommon Files |
| .CC0 | Uncommon Files |
| .CC1 | Uncommon Files |
| .CC2 | Uncommon Files |
| .CC3 | Uncommon Files |
| .CC4 | Uncommon Files |
| .CC5 | Uncommon Files |
| .CC6 | Uncommon Files |
| .CC7 | Uncommon Files |
| .CC8 | Uncommon Files |
| .CC9 | Uncommon Files |
| .CCAD | Uncommon Files |
| .CCB | Uncommon Files |
| .CCC | Uncommon Files |
| .CCDOC | Uncommon Files |
| .CCE | Uncommon Files |
| .CCG | Uncommon Files |
| .CCI | Uncommon Files |
| .CCITT | Uncommon Files |
| .CCJ | Uncommon Files |
| .CCK | Uncommon Files |
| .CCL | Uncommon Files |
| .CCM | Uncommon Files |
| .CCO | Uncommon Files |
| .CCPR | Uncommon Files |
| .CCQ | Uncommon Files |
| .CCRF | Uncommon Files |
| .CCS | Uncommon Files |
| .CCU | Uncommon Files |
| .CCV | Uncommon Files |
| .CCW | Uncommon Files |
| .CCXML | Uncommon Files |
| .CCY | Uncommon Files |
| .CCZ | Uncommon Files |
| .CC_ | Uncommon Files |
| .CD0 | Uncommon Files |
| .CD1 | Uncommon Files |
| .CD150 | Uncommon Files |
| .CD3 | Uncommon Files |
| .CD4 | Uncommon Files |
| .CD5 | Uncommon Files |
| .CD6 | Uncommon Files |
| .CD7 | Uncommon Files |
| .CD8 | Uncommon Files |
| .CD9 | Uncommon Files |
| .CDAT | Uncommon Files |
| .CDBK | Uncommon Files |
