| asmdat | Extech Light Meter Archive Data |
| asmdot | SolidWorks Assembly Template |
| asmprp | SolidWorks Assembly Properties Template |
| asn | Abstract Syntax Notation One Data |
| asn | GameSpy Arcade Skin Data |
| asn | NCBI ASN.1 Data |
| asn1 | Abstract Syntax Notation One Data |
| aso | Autodesk Simulation Mechanical Nodal Stress Results Data |
| asp | Adobe Color Separation Setup Data |
| asp | Alphacam Stone Post Data |
| asp | MGS Antenna SPK File |
| asp | Procomm Plus ASPect Script |
| asq | Agresso SQL Statement Data |
| asr | Adobe Photoshop Scratch Data |
| ass | FullProf Average Size Strain Plot Data |
| assetproj | Camtasia Studio Asset Information |
| assoc | Associate This File Association Database |
| asstore | Microsoft SQL Server Property String Store |
| assy | Siemens NX Assembly Data |
| ast | ActivTrak Session Track Data |
| ast | Adobe Color Separation Table |
| ast | AstroGrav Astronomy Simulation Data |
| ast | Autodesk Simulation Mechanical Strain Results Data |
| ast | ESwin Wizard |
| ast2 | Astrotite 200X Data |
| astm | Optitex 3D Suite ASTM Grading File |
| astore | LUX Variables Data |
| astore | Microsoft SQL Server Property Main Store |
| asu | Toolbook Package Definition |
| asv | MakeMusic Finale Auto-save File |
