| ACC | Data | 10 | dictionary.acc |
| ACCDA | Microsoft Access Application | 9 | UTILITY.ACCDA |
| ACCDE | Database | 27 | ACWZMAIN.ACCDE |
| ACCDT | Database | 176 | Users.accdt |
| ACCDU | Microsoft Access Application | 18 | ACWZDAT12.ACCDU |
| ACCFL | Microsoft Access Application | 7 | Issues.accfl |
| ACCFT | Microsoft Access Application | 72 | Category.accft |
| ACCTB | Database | 1 | Core.acctb |
| ACG | Data | 14 | F1.ACG |
| ACL | Data | 714 | M1033Eva.ACL |
| ACM | Driver | 63 | msgsm32.acm |
| ACS | Video | 20 | LOGO.ACS |
| ADC | Raster Image | 2 | L1033.ADC |
| ADM | System | 30 | danish.adm |
| ADML | System | 19361 | TerminalServer.adml |
| ADMX | System | 2011 | WorkplaceJoin.admx |
| ADP | Microsoft Access Project | 2 | NorthwindCS.adp |
| AIO | Developer | 3 | hpo5400a.aio |
| AM | Developer | 39 | XCPCDatabase.am |
| AMX | Plugin | 20 | kernelbase.amx |
| ANI | System | 173 | aero_working_xl.ani |
| AODL | | 3152 | SyncEngine-2020-01-22.0658.1000.1.aodl |
| APL | GIS | 34 | am_cab.apl |
| APM | Raster Image | 11 | M2057HAZ.APM |
| APPCACHE | Text | 2 | calibre.appcache |
| APPX | Developer | 13 | ADCNotificationClient.appx |
| ART | CAD | 12 | ring.art |
| ASCX | Internet Web | 66 | confirmation.ascx |
| ASD | Backup | 7 | stleafcard.asd |
| ASP | Internet Web | 140 | ipp_0003.asp |
| ASPX | Internet Web | 203 | preview.aspx |
| AUTOMATICDESTINATIONS-MS | System | 6 | 7e4dca80246863e3.automaticDestinations-ms |
| AUX | | 724 | MailClient.Collections.ni.dll.aux |
| AVI | Video | 111 | INTRO.AVI |
| AW | Data | 170 | libpgetopts.aw |
| AX | Dynamic Link Library | 1692 | MpegSplitter.ax |
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