| .B1N | Unknown Developer | Harvinaiset Tiedostot | Binary Screen Image File | Unknown Software | Unknown Developer |
| .B2A | Smith Micro Software | Koodatut tiedostot | Btoa Encoded File | Atob | Unknown Developer |
| .B2Z | Unknown Developer | Datatiedostot | B2Z dVS Model/Object | Unknown Software | Unknown Developer |
| .B5B5 | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .B7S | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BAI | B2W Software | Laajennustiedostot | BUILD2WIN Add-in | Unknown Software | Unknown Developer |
| .BAI2 | Bank Administration Institute (BAI) | Datatiedostot | Cash Management Balance Reporting Specifications Version 2 | Unknown Software | Unknown Developer |
| .BALL | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BANNER | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BAO | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BATH | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BBZ | BitBlaze | Äänitiedostot | Bitblaze Audio File | Unknown Software | Unknown Developer |
| .BC3 | Unknown Developer | Datatiedostot | FIEBDC Database | FIEBDC | Unknown Developer |
| .BCS | The Wavelength | Asetustiedostot | Batch Compiler Specification File | Unknown Software | Unknown Developer |
| .BD1 | Unknown Developer | Pelitiedostot | X Operations Map Block Location | X Operations | Unknown Developer |
| .BDCFG | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BDIFF BUPDATE BINARY UPDATE | Unknown Developer | Datatiedostot | Bdiff Bupdate Binary Update | Unknown Software | Unknown Developer |
| .BDMB | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BDSM | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BDU | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BDZ | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BEACON | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BEAT | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BEATWAVE | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BER | Unknown Developer | Harvinaiset Tiedostot | German Bericht Report File | Unknown Software | Unknown Developer |
| .BF4 | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BFAB | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BFCE | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BFH | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BFN | Brother International Corporation | Fonttitiedostot | Brother Embroidery Software Font | Unknown Software | Unknown Developer |
| .BFO | Unknown Developer | Sovelluskehittäjän tiedostot | GT Nexus PDF Template | GT Nexus | Unknown Developer |
| .BHB | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BIG | Electronic Arts | Pelitiedostot | Electronic Arts Game Data File | Unknown Software | Unknown Developer |
| .BILL | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BIN | Unknown Developer | Levyn kuvatiedostot | Binary Disk Image File | Unknown Software | Unknown Developer |
| .BJD | NDDigital | Datatiedostot | NDDigital Print Bureau File | Unknown Software | Unknown Developer |
| .BKG | Samsung Electronics | Datatiedostot | Samsung Document | Unknown Software | Unknown Developer |
| .BKH | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BKL | KeyCarbon | Datatiedostot | KeyCarbon Binary Keystroke Log | Unknown Software | Unknown Developer |
| .BKT | Zortech | Harvinaiset Tiedostot | Zortech Data File | Unknown Software | Unknown Developer |
| .BLACK | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BLI | Thomson Reuters Corporation | Harvinaiset Tiedostot | Thomson Speedtouch Firmware File | Unknown Software | Unknown Developer |
| .BLOCK | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BLOSSOMS | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BLURB | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BM_ | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BNN | Unknown Developer | Graafiset Tiedostot | Vectorial Image File | Unknown Software | Unknown Developer |
| .BN_ | Unknown Developer | Harvinaiset Tiedostot | Ntgraph Ze32v215 File | Unknown Software | Unknown Developer |
| .BOA | Unknown Developer | Pakatut tiedostot | BOA Constrictor Compressed Archive | Unknown Software | Unknown Developer |
| .BONGO | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BOR | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BP | Data Access Worldwide | Sovelluskehittäjän tiedostot | DataFlex Business Process Object | Unknown Software | Unknown Developer |
| .BPG | Open Source | Rasterikuvatiedostot | Better Portable Graphics (BPG) Image | Unknown Software | Unknown Developer |
| .BPU | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BRHQUJL | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BRUSH | Xerox | Rasterikuvatiedostot | Xerox Doodle Brush Bitmap Image | Unknown Software | Unknown Developer |
| .BTX | SmartWare Corporation | Varmuuskopiointitiedostot | SmartWare Backup Text File | Unknown Software | Unknown Developer |
| .BUF | Unknown Developer | Väliaikaiset Tiedostot | Buffer File | Unknown Software | Unknown Developer |
| .BUSH | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .BUTTHEREIS | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BVHJBVHJ | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BWK | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .BWV | Unknown Developer | Harvinaiset Tiedostot | Business Wave File | Unknown Software | Unknown Developer |
| .BXX | Bitmanagement Software | Asetustiedostot | BS Contact Parameter File | Unknown Software | Unknown Developer |
| .BYL | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BYZ | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .BZF | Unknown Developer | Pelitiedostot | Game File | Unknown Software | Unknown Developer |
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