| art | Artifacts for Visual Studio Artifact Data |
| art70 | Bernina ArtLink v7 Embroidery Data |
| art80 | Bernina ArtLink v8 Embroidery Data |
| artborder | ArtBorder Data |
| artf | Adobe FreeHand Xtra Data |
| arti | Artizen HDR Data |
| artpro2 | Arturia Prophet V Data |
| artwork | iOS Artwork Data |
| artz | Adobe Illustrator for Mac Data |
| arv | CA Harvest SCM Data |
| arv | Microsoft Autoroute User Data |
| arxml | AUTOSAR XML Data |
| arz | MySQL Archive Storage Engine Data |
| as2 | Activstudio Data |
| as2 | Time Stamp Project Grid Information |
| as3a | ActivInspire Resource Pack |
| as4 | AskSam Database Backup |
| as4 | Clone Manager Scan Results Data |
| as4 | IBM AS/400 Client Access Data |
| as4 | SurfSaver Data |
| as4a | ActivInspire Resource Pack |
| asa | Microsoft Visual InterDev Data |
| asab | OpenRC Temporary Output Data |
| asas | ANSYS ASAS Input File |
| asat | TurboCAD Assemble SAT 3D Model |
| asb | Alphacam Stone VB Macro |
| asc | Apophysis Script |
| asc | Atari Jaguar Sound Patch |
| asc | Atlantis Word Processor Spellchecker Data |
| asc | Autodesk 3D Studio Scene in ASCII |
