| CAB | Archive | 123 | OWOW64WW.cab |
| CACHE | Temporary | 6 | bootcat.cache |
| CAG | Vector Image | 1 | POPULAR.CAG |
| CAMP | Settings | 10 | D50.camp |
| CAP | Data | 3 | atiumdva.cap |
| CDMP | System | 10 | wsRGB.cdmp |
| CDP | Game | 3 | CDPGlobalSettings.cdp |
| CDR | Vector Image | 2 | MS.CDR |
| CER | Internet Web | 28 | SignedManagedObjects.cer |
| CFG | Developer | 442 | DISTLIST.CFG |
| CGM | Vector Image | 4 | MS.CGM |
| CHK | Data | 64 | MSS.chk |
| CHM | Compiled HTML Help | 775 | MCE.CHM |
| CHQ | Windows Help | 2 | windows.chq |
| CHR | 3D Image | 6 | charsettable.chr |
| CHS | System | 5 | NOISE.CHS |
| CHT | Game | 5 | NOISE.CHT |
| CI | System | 16 | 00010009.ci |
| CLB | System | 7 | R000000000001.clb |
| CLS | Developer | 4 | FPHOVER.CLS |
| CMB | Data | 62 | EP0NCJ7F.CMB |
| CMD | Windows NT Command Script | 13 | usrlogon.cmd |
| CMF | 3D Image | 20 | Segment2.cmf |
| CNT | System | 44 | MSACAL70.CNT |
| CNV | Dynamic Link Library | 50 | WNWRD232.CNV |
| COM | Executable Application | 87 | GRAPHICS.COM |
| COMMENTS | Data | 10 | machine.config.comments |
| COMPOSITEFONT | Font | 20 | GlobalSansSerif.CompositeFont |
| CONF | Settings | 1 | DiskSnapshot.conf |
| CONFIG | Developer | 366 | Policy.1.2.Microsoft.Interop.Security.AzRoles.config |
| CONTACT | Data | 2 | Bill.contact |
| COV | Page Layout | 16 | urgent.cov |
| CPA | CAD | 6 | iglhxa32.cpa |
| CPF | Settings | 1 | ZIPCODES.CPF |
| CPI | Video | 4 | ega.cpi |
| CPL | Dynamic Link Library | 172 | collab.cpl |
| CPX | Settings | 12 | 12520850.cpx |
| CRT | Security Certificate | 2 | M1033DSK.CRT |
| CRWL | Data | 9 | SystemIndex.1.Crwl |
| CS | Developer | 35 | PasswordValueTextBox.cs |
| CSD | Game | 2 | M1033DSK.CSD |
| CSG | CAD | 2 | settings.csg |
| CSO | 3D Image | 26 | PanoCapD-pixelshader.cso |
| CSV | Data | 1 | WERF1CE.tmp.csv |
| CTG | Data | 2 | PUB60SP.CTG |
| CTY | Game | 8 | VSTSProf.cty |
| CUR | System | 965 | cross_m.cur |
| CUSTOMDESTINATIONS-MS | System | 9 | f01b4d95cf55d32a.customDestinations-ms |
| CW | Page Layout | 11 | l1033.cw |
| CWL | System | 1 | SAMPLE1.CWL |
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