| bsdf | Zemax Scattering Distribution Data |
| bsdiff | Binary DIFF Data |
| bsdl | Xilinx BSDL File |
| bsig | ClamAV Binary Signature |
| bsj | SpliceV Backsplice Junctions Data |
| bsk | Blaise Database BSK Data |
| bsk | Bryce Skies Data |
| bsml | Bioinformatic Sequence Markup Language Document |
| bsmx | BeerSmith Recipe Data |
| bsmz | Compressed BSML Document |
| bsn | SWAT Basin Input Data |
| bso | BSML Overlay Data |
| bson | Binary JSON Data |
| bsr | Bacula Bootstrap File |
| bsw | Microsoft Office Business Scorecard Manager Workspace |
| bswx | BIMReview 3D Model Data |
| bswx | Microsoft Office PerformancePoint Server Data |
| bsy | VTrain Learning Card |
| bt | Binary Terrain Data |
| bt | BluffTitler Show Data |
| bt0 | Band-in-a-Box Temporary Data |
| bt1 | CBA III Battery Test Data |
| bt2 | Batch Barcode Maker Data |
| bt2 | CBA III Battery Test Data |
| bta | Bend-Tech v3 Assembly File |
| btax | Bend-Tech v6 Assembly File |
| btf | NationsBank Check Image |
| bth | TimeZero Bathy Recorder Data |
| btif | NationsBank Check Image |
| btk | CLwin Tekton Database |
| btl | SolidWorks Sheet Metal Bend Table |
| btmsp | MALDI BioTyper Main Spectra File |
| bto | Bryce Tree Object |
| btoa | Ascii85 Encoded Data |
| btp | Bend-Tech v3 Plate File |
