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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .B1 | The Catalina Group | Compressed Files | B1 Compressed Archive | B1 Free Archiver | The Catalina Group |
| .B64 | Smith Micro Software | Compressed Files | Base64 MIME-Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .BA | Senthil Kumar R | Compressed Files | Scifer External Header Archive | Scifer | Senthil Kumar R |
| .BAR | BlackBerry | Compressed Files | BlackBerry OS 10 Application Installation Package | Blackberry 10 | BlackBerry |
| .BAR FILE EXTENSION | BlackBerry | Compressed Files | BlackBerry OS 10 Application Installation Package | Blackberry 10 | BlackBerry |
| .BCA | Nemetschek Group | Compressed Files | Allplan Backup Catalog File | Allplan Engineering | Nemetschek Group |
| .BCZ | Siemens AG | Compressed Files | Siemens Teamcenter Zipped Briefcase File | Siemens Teamcenter | Siemens PLM Software |
| .BH | Microchip Technology Inc. | Compressed Files | BlakHole Archive | ZipTV | Microchip Technology Inc. |
| .BIN | Unknown Developer | Compressed Files | Binary Disk Image File | IsoBuster | Smart Projects |
| .BMA | Eugene Roshal | Compressed Files | Compressed Archive File | WinRAR | Eugene Roshal |
| .BNDL | Electronic Arts | Compressed Files | Game Data Bundle File | Need For Speed | Electronic Arts |
| .BOA | Unknown Developer | Compressed Files | BOA Constrictor Compressed Archive | Unknown Software | Unknown Developer |
| .BOO | Open Source | Compressed Files | Booasm Compressed Archive | ZipZag | Open Source |
| .BOZ | Julian Seward | Compressed Files | BZIP Over ZIP Compressed Archive | bzip2 | Julian Seward |
| .BPA | SimpleTech | Compressed Files | StorageSync Backup Archive | StorageSync | SimpleTech |
| .BSC | Microsoft Corporation | Compressed Files | Visual Studio Source Browser Information File | Microsoft Visual Studio | Microsoft Corporation |
| .BSQ | ESRI | Compressed Files | ArcView Band Sequential Image | ArcView | ESRI |
| .BSZ | BS GLOBAL Organization | Compressed Files | BS.Player Compressed Skin File | BS Player | BS GLOBAL Organization |
| .BTC | Microsoft Corporation | Compressed Files | Becker Tools Compressed Archive | MS-DOS | Microsoft Corporation |
| .BUNDLE | Apple | Compressed Files | Mac OS X Application Bundle | macOS | Apple |
| .BVX | Bravura Software | Compressed Files | OptiTune Install Package | OptiTune | Bravura Software |
| .BZ | Smith Micro Software | Compressed Files | Bzip Compressed File | 7-Zip | Igor Pavlov |
| .BZ2 | Julian Seward | Compressed Files | Bzip2 Compressed File | 7-Zip | Igor Pavlov |
| .BZA | Ivan Zahariev | Compressed Files | Bzip2 Compressed File Archive | IZArc | Ivan Zahariev |
| .BZIP | Julian Seward | Compressed Files | BZIP Compressed Archive | bzip2 | Julian Seward |
| .BZIP2 | Julian Seward | Compressed Files | Bzip2 Compressed Archive | 7-Zip | Igor Pavlov |
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