| ax3 | Apex Sketch v3 Document |
| ax4 | Apex Sketch v4 Document |
| ax5 | Apex Sketch v5 Document |
| axls | Authentica Secure Office Protected Excel Document |
| axz | Apex Sketch v6 Document |
| b | IRIS Editor Shortened Format File |
| b4u | docPointer Visual ReadMe Document |
| bak | Canvas Drawing Backup |
| bakx | MakeMusic Finale Notation Backup |
| bamboopaper | Wacom Bamboo Paper Document |
| 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 |
| OfficePrinter Label 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 |
| bcsv | Binary CSV Data |
| 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 | Adobe FrameMaker Book Document |
| bk! | Corel WordPerfect Document Backup |
| bk1 | Corel WordPerfect Document Backup |
| bk2 | Corel WordPerfect Document Backup |
| bk3 | Corel WordPerfect Document Backup |
| bk4 | Corel WordPerfect Document Backup |
| bk5 | Corel WordPerfect Document Backup |
| bk6 | Corel WordPerfect Document Backup |
| bk7 | Corel WordPerfect Document Backup |
| bk8 | Corel WordPerfect Document Backup |
| bk9 | Corel WordPerfect Document Backup |
| bkn | Corel WordPerfect Document Backup |
| bks | Microsoft Works Spreadsheet Backup |
| bll | Binary Lasergraphics Language Document |
| blogthis | Windows Live Writer Data |
| blurb | BookWright Document |
| bmf | BrainMine Mind Map Document |
| bml | Braille2000 Braille Data |
| bmm | FX AccuCharts Market Watch Document |
| bmml | Braille Music Markup Language File |
| bn | NewsRoom Document |
| bna | Barna Word Processor Document |
| bnk | ExamView Question Bank |
| bnr | Banner Mania Banner |
| bns | BinNews BNS Message-Id Data |
| bobo | ClarisWorks Data |
| boc | EasyWord Big Document |
| book | Adobe FrameMaker Book |
| bop | Business Office Pro Document |
| bpdx | Adobe Acrobat Batch PDX Data |
| bpf | Baan ERP Document |
| bpmn | Business Process Model and Notation Document |
| bps | Microsoft Works Document Backup |
| bpt | IBM InfoSphere Blueprint Director Document |
| br2 | Bryce 2 Scene |
| br3 | Bryce 3 Scene |
| br4 | Bryce 4 Scene |
| br5 | Bryce 5 Scene |
| br6 | Bryce 6 Scene |
| br7 | Bryce 7 Scene |
| brc | Bryce 2 Scene |
| brd | Cadence Allegro PCB Layout |
| EAGLE PCB Layout |
| KiCad Board Layout File |
| brep | Boundary Representation File |
| brf | Braille Formatted File |
| brh | Baraha Document |
| brl | BRL-CAD Document |
| MicroBraille Document |
| brlcad | BRL-CAD Document |
| bro | PrintShop Deluxe Brochure |
| brt | Photo Builder Template |
| bry2 | Bryce 2 Scene |
| bst | BibTeX Document Style |
| bstl | StereoLithography Data |
| bt5 | ERP5 Business template |
