| asc | SOBEK RTC Communication Data |
| asce | ASCE Data |
| asd | Ableton Warp Analysis File |
| asd | ASD TerraSpec Data |
| asdf | Advanced Scientific Data Format |
| ase | Alice Scene Export Data |
| asep | Separator for Mac Data |
| asf | ANALECT FT-IR Data |
| ash | ActivTrak Session Track History Data |
| ash | Nintendo Wii System Menu Data |
| ashlang | Ashampoo Media Player Language Data |
| asi | Miles Sound System Data |
| asice | DigiDoc BDOC Digital Signature |
| asif | AEDT Standard Input Data |
| asis | Apache mod_asis Data |
| asj | Aldfaer Data File |
| ask | Ableton Live Skin |
| ask | Ad-Aware Skin Data |
| ask | ALShow Media Player Skin |
| ask | AskSam Database |
| asl | AppSight Console Log |
| asl | Miranda IM Emotions Definition |
| aslquery | Mac OS X Console Query |
| asm | Alphacam Stone Param Macro |
| asm | Pro/ENGINEER Assembly Data |
| asm | PTC Creo Assembly Data |
| asmdat | Extech Light Meter Archive Data |
| asmdot | SolidWorks Assembly Template |
| asmprp | SolidWorks Assembly Properties Template |
| asn | Abstract Syntax Notation One Data |
