| b4u | docPointer Visual ReadMe Document |
| bakx | MakeMusic Finale Notation Backup |
| ban | Broderbund PrintMaster Banner |
| bax | Bluebeam PDF Revu Markup XML |
| bbcd | BobCAD-CAM Document |
| bbdoc | Buildbox Document |
| bbe | Brainbloom Document Exchange File |
| bbl | BibTeX Bibliographic Reference |
| bbs | BBS Directory List |
| bbxt | BBEdit Document |
| bc5 | Impression 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 |
| bgcf | Belltech Greeting Card Designer Document |
| bgv | BonanzaGraf Financial Presentation |
| bib | BibTeX Document |
| big5 | Chinese Text Document |
| bimx | ArchiCAD BIMx Document |
| biot | BiotSavart Magnetic Design Data |
| bip | KeyShot Scene |
| biz | Broderbund PrintMaster Business Card |
| bjo | TabRite Tablature |
| bjt | LTspice Bipolar Design |
| bk! | Corel WordPerfect Document Backup |
