| at2 | Aldus Persuasion v2 Template |
| atd | Alphacam Lathe Drawing |
| atom | Atom Syndication Format File |
| atw | AnyTime Organizer Deluxe Document |
| av | Final Draft AV v1 Document |
| avery | Avery Design and Print Online Label |
| aw | Applixware Words Document |
| awd | Ability Draw Document |
| awd | Microsoft Fax Image |
| awp | Ability Write Template |
| aws | Ability Spreadsheet Document |
| awt | AbiWord Template |
| aww | Ability Write Document |
| b4u | docPointer Visual ReadMe Document |
| bakx | MakeMusic Finale Notation Backup |
| ban | Broderbund PrintMaster Banner |
| bax | Bluebeam PDF Revu Markup XML |
| bbcd | BobCAD-CAM Document |
| bbe | Brainbloom Document Exchange File |
| bbl | BibTeX Bibliographic Reference |
| bbs | BBS Directory List |
| bbxt | BBEdit Document |
| bcc | Calendar Creator v7 Document |
| bcd | Business Card Designer Plus Document |
| bcf | Belltech Business Card Designer Pro Document |
| bcn | Business Card Pro Design |
| bco | Business Card Designer Plus Document |
| bcp | Business Card Designer Plus Document |
| bdb | Microsoft Works Database Backup |
| bdc | West Point Bridge Designer Document |
| bdl | PTC Creo Bundle File |
| bean | Bean Rich Text Document |
| bfc | Windows 95 Briefcase Document |
| bff | WorldToolKit Binary NFF Data |
| bfx | Bluebeam PDF Revu Exchange XML |