| ACC | Data | 4 | ACCESS12.ACC |
| ACCDA | Microsoft Access Application | 4 | UTILITY.ACCDA |
| ACCDE | Database | 12 | ACWZLIB.ACCDE |
| ACCDT | Database | 73 | Tabs.accdt |
| ACCDU | Microsoft Access Application | 8 | ACWZUSR12.ACCDU |
| ACCFL | Microsoft Access Application | 7 | Assets.accfl |
| ACCFT | Microsoft Access Application | 27 | Start End Dates.accft |
| ACCTB | Database | 1 | Core.acctb |
| ACG | Data | 14 | OFFCAT.ACG |
| ACL | Data | 88 | MsSp7lt.acl |
| ACM | Driver | 44 | SL_ANET.ACM |
| ACS | Video | 20 | MNATURE.ACS |
| ADC | Raster Image | 2 | L1033.ADC |
| ADM | System | 7 | AER_1033.ADM |
| ADML | System | 825 | SoundRec.adml |
| ADMX | System | 825 | GroupPolicy.admx |
| ADP | Microsoft Access Project | 2 | NorthwindCS.adp |
| AIO | Developer | 3 | hpo5300a.aio |
| AM | Developer | 34 | AF032057.am |
| AMX | Plugin | 18 | kernel32.amx |
| ANI | System | 98 | dinosau2.ani |
| APL | GIS | 2 | M1033DSK.APL |
| APM | Raster Image | 11 | M16393HEE.APM |
| APPCACHE | Text | 1 | threshold[1].appcache |
| APPX | Developer | 9 | Microsoft.NET.Native.Runtime.1.1.DemoProvisioning.appx |
| ART | CAD | 2 | L1033.ART |
| ASCX | Internet Web | 55 | wizardFinish.ascx |
| ASD | Backup | 2 | VIDEO.ASD |
| ASP | Internet Web | 19 | ipp_0014.asp |
| ASPX | Internet Web | 165 | default.aspx |
| AUTOMATICDESTINATIONS-MS | System | 6 | 7e4dca80246863e3.automaticDestinations-ms |
| AVI | Video | 39 | FlickAnimation.avi |
| AW | Data | 71 | ACMAIN10.AW |
| AX | Dynamic Link Library | 155 | mpg2data.ax |
/1 
日本語