| asp | Procomm Plus ASPect Script |
| 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 | 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 |
| asv | Pegasus Mail Auto-saved Message |
| asv | QuarkXPress Autosave Data |
| asvx | MakeMusic Finale Auto-save File |
| aswcs | Avast Compressed Skin |
| asws | Avast Skin |
| asy | Xilinx CORE Generator Graphical Symbol File |
| at | ETCBC Analyzed Text Data |
| at1 | KJT-200 Absorbance Data |
| at4p | AmpliTube 4 Preset |
| at5p | AmpliTube 5 Preset |
| atb | Alphacam Lathe VB Macro |
| atc | AceText Collection File |
| atc | AttacheCase Encrypted File |
| atc | Autodesk AutoCAD Tool Catalog |
| atc_list | aTube Catcher Data |
