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| Extension | Information |
| BLG | ARCSOLO Backup Log BibTeX Log MicroSim PCBoard Backward ECO Log File Windows Binary Performance Log |
| BLI | BLINK Archiver Archive (De Trans Software) |
| BLK | Amiga IFF (Amiga) Lightscape Block Library ProWORX Nxt Block Data (Schneider Electric) VersaPro Block Wavefront Image (Alias) WordPerfect Temporary File (Corel) Win32Forth Block Data |
| BLL | INPRISE Format Language Library VBS/European-A Worm |
| BLN | Rise of Nations Campaign Media File (Microsoft) |
| BLR | BIACORE Instruments and BIAlite Project (Biacore) |
| BLS | BIACORE Instruments and BIAlite Project (Biacore) Brush Lettering Saved Brush Lettering Style (EK Success, Ltd., pcCrafter, Inc.) |
| BLT | Saved AIM Buddy List File Wordperfect for DOS (Corel) CATC Merlin Bluetooth Trace Files (Computer Access Technology Corporation (CATC)) |
| BLW | ArcView World File For BIL Image (ESRI) |
| BLY | Fifa World Cup Game Art Loadgame file. Bitmap Graphic Blazon Heraldic Shield Emblaze.Creator File Serial Number File Twinkle Bulbs Bulb File |
| BM | X Windows System Bitmap |
| BM$ | Modem Bitware Fax disk2 file |
| BM1 | Apogee BioMenace Data |
| BM2 | Subspace/Continuum Graphic |
| BMB | SLICS Bounding Box Information Pro/ENGINEER Temporary File (PTC) |
| BMC | IBM Voice Type languages Newuser File |
| BME | Beatmania Music Simulator File (Konami Broadcasting) |
| BMF | Corel Flow Image File FloorPlan Project File (IMSI (International Microcomputer Software Inc.)) BMF Bitmap |
| BMG | Bert's Dinosaurs File |
| BMI | Blue Martini Import File Buzz Instrument |
| BMK | BMC Software Patrol Icon File Help Bookmark |
