| .B1N | Unknown Developer | Uncommon Files | Binary Screen Image File | Unknown Software | Unknown Developer |
| .B2Z | Unknown Developer | Data Files | B2Z dVS Model/Object | Unknown Software | Unknown Developer |
| .B5B5 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .B7S | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BAI | B2W Software | Plugin Files | BUILD2WIN Add-in | Unknown Software | Unknown Developer |
| .BAI2 | Bank Administration Institute (BAI) | Data Files | Cash Management Balance Reporting Specifications Version 2 | Unknown Software | Unknown Developer |
| .BALL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BANNER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BAO | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BATH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BBZ | BitBlaze | Audio Files | Bitblaze Audio File | Unknown Software | Unknown Developer |
| .BCS | The Wavelength | Settings Files | Batch Compiler Specification File | Unknown Software | Unknown Developer |
| .BDCFG | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BDIFF BUPDATE BINARY UPDATE | Unknown Developer | Data Files | Bdiff Bupdate Binary Update | Unknown Software | Unknown Developer |
| .BDMB | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BDSM | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BDU | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BDZ | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BEACON | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BEAT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BEATWAVE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BER | Unknown Developer | Uncommon Files | German Bericht Report File | Unknown Software | Unknown Developer |
| .BF4 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BFAB | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BFCE | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BFH | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BFN | Brother International Corporation | Font Files | Brother Embroidery Software Font | Unknown Software | Unknown Developer |
| .BHB | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BIG | Electronic Arts | Game Files | Electronic Arts Game Data File | Unknown Software | Unknown Developer |
| .BILL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BIN | Unknown Developer | Disk Image Files | Binary Disk Image File | Unknown Software | Unknown Developer |
| .BJD | NDDigital | Data Files | NDDigital Print Bureau File | Unknown Software | Unknown Developer |
| .BKG | Samsung Electronics | Data Files | Samsung Document | Unknown Software | Unknown Developer |
| .BKH | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BKL | KeyCarbon | Data Files | KeyCarbon Binary Keystroke Log | Unknown Software | Unknown Developer |
| .BKT | Zortech | Uncommon Files | Zortech Data File | Unknown Software | Unknown Developer |
| .BLACK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BLI | Thomson Reuters Corporation | Uncommon Files | Thomson Speedtouch Firmware File | Unknown Software | Unknown Developer |
| .BLOCK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BLOSSOMS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BLURB | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BM_ | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BNN | Unknown Developer | Graphic Files | Vectorial Image File | Unknown Software | Unknown Developer |
| .BN_ | Unknown Developer | Uncommon Files | Ntgraph Ze32v215 File | Unknown Software | Unknown Developer |
| .BOA | Unknown Developer | Compressed Files | BOA Constrictor Compressed Archive | Unknown Software | Unknown Developer |
| .BONGO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BOR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BP | Data Access Worldwide | Developer Files | DataFlex Business Process Object | Unknown Software | Unknown Developer |
| .BPG | Open Source | Raster Image Files | Better Portable Graphics (BPG) Image | Unknown Software | Unknown Developer |
| .BPU | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BRHQUJL | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BRUSH | Xerox | Raster Image Files | Xerox Doodle Brush Bitmap Image | Unknown Software | Unknown Developer |
| .BTX | SmartWare Corporation | Backup Files | SmartWare Backup Text File | Unknown Software | Unknown Developer |
| .BUF | Unknown Developer | Temporary Files | Buffer File | Unknown Software | Unknown Developer |
| .BUSH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BUTTHEREIS | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BVHJBVHJ | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BWK | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .BWV | Unknown Developer | Uncommon Files | Business Wave File | Unknown Software | Unknown Developer |
| .BXX | Bitmanagement Software | Settings Files | BS Contact Parameter File | Unknown Software | Unknown Developer |
| .BYL | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BYZ | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BZF | Unknown Developer | Game Files | Game File | Unknown Software | Unknown Developer |
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