| bjk | Blaise Database BJK Data |
| bjl | BJL Business Systems Active Translation Data |
| bjs | Moldex3D Batch Job Settings Data |
| bjson | Binary JSON Data |
| bk | Movie Magic Screenwriter Document Backup |
| Power Chess Book Data |
| bk0 | Aspen HYSYS Backup File |
| bk1 | Aspen HYSYS Backup File |
| CA ERwin Data Modeler Backup |
| FlashGet Database Backup |
| Windows Indexing Service Data |
| bk2 | Aspen HYSYS Backup File |
| Cashbook Complete Automated Backup Data |
| FlashGet Database Backup |
| Windows Indexing Service Data |
| bk3 | Cashbook Complete Automated Backup Data |
| Cashbook Complete Company Data |
| FlashGet Database Backup |
| bk4 | FlashGet Database Backup |
| bka | Oracle Enterprise Manager OMS Backup Data |
| bkb | VariCAD Block File |
| bke | BackupEarth Compressed Data |
| bkj | Symantec Backup Exec Job |
| bkl | KeyCarbon Binary Keystroke Log |
| bkmk | Internet Explorer Bookmark Data |
| Yummy FTP Pro Bookmark |
| bkp | Steinberg WaveLab Backup Plan |
| bkr | BK ReplaceEm Fileset |
| bksln | Freescale BeeKit Solution File |
| bkt | Zortech 3 Tools Samples Data |
| bku | Sage Timeslips Backup |
| bkup | Groundspeak Wherigo Backup File |
| bkx | X-Rite eXact Manager Device Backup |
| bky | bookkey Bookmark Data |
| SmartWare Backup Keyboard Data |
| bkz | FileFort Backup Data |
| bla | Adobe Photoshop Black Color Separation Data |
| Blaise Datamodel |
| blade | Blade Template Engine View Data |
| blb | Act! Blob Data |
| Treepad Database Blob Data |
| bld | Bingooo Language Definition Data |
| Right-J Load Calculation Data |
| bldinp | OnScale Build Input Data |
| blend1 | Blender Document Backup |
| blend2 | Blender Document Backup |
| blf | CLFS BaseLog |
| Common Log File System Binary Data |
| MasterWorks Data |
| bli | Blaise Prepared Library |
| LinkOne Library Data |
| blif | Berkeley Logic Interchange Format Data |
| blip | radR Project BLIP Data |
| blk | Abbyy FineReader Block Template |
| Autodesk 3D Studio Max Block Library |
| Autodesk AutoCAD Block Template |
| Corel WordPerfect Office Temporary BLK Data |
| Leica BLK360 Data |
| Lightscape Block File |
| bll | ENVI Bad Lines List |
| blm | Envisioneer Catalog Data |
| Rightmove Bulk Load Mass Data |
| bln | Golden Software Blanking |
| blo | IBM DB2 Binary Large Object Data |
| blob | IBM DB2 Binary Large Object Data |
| Valve Steam Client Registry Data |
| WOW! Diagnostic BLOB Data |
| blockplt | Lego Mindstorms NXT Block Palette Data |
| blow5 | SLOW5 Binary Data |
| blr | Biacore BIAlite Project Data |
| blrb | Apple Extensions Manager Info Data |
| bls | Brush Lettering Saved Brush Style |
| blt | AOL Instant Messenger Buddy List |
| CATC Merlin Bluetooth Trace |
| bluebutton | VA Blue Button Data |
| bluestacks | BlueStacks App Player Data |
| blw | Adobe Photoshop Black and White Presets Data |
| blwd | Claris Home Page Data |
| blx | Magellan Mapsend Map Data |
| blz | Crossword Power Tools Crossword Library |
