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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .B2 | Progress Software Corporation | Database Files | Progress Database | ObjectStore | ESW Capital Group |
| .BAK | Various Developers | Database Files | General Backup File | Microsoft SQL Server | Microsoft Corporation |
| .BBT | Procedimientos-Uno, S.L. | Database Files | BTwin Local Database File | BTwin | Procedimientos-Uno, S.L. |
| .BDE | Borland | Database Files | Borland Database Engine | Borland C++ | Micro Focus International plc |
| .BF2 | Management Computer Controls, Inc. | Database Files | BIDFAX 2000 Database File | BIDFAX 2000 | Management Computer Controls, Inc. |
| .BI | Microsoft Corporation | Database Files | Binary File | Microsoft Notepad | Microsoft Corporation |
| .BPL | Autodesk, Inc. | Database Files | AutoCAD Batch Plot File | Autodesk AutoCAD | Autodesk, Inc. |
| .BQS | BQE Software | Database Files | BillQuick Database | BillQuick | BQE Software |
| .BTR | Pervasive Software | Database Files | Btrieve Database File | Pervasive Btrieve Database Manager | Actian Corporation |
| .BTREE | Apple | Database Files | Apple Mac OS HFS+ B-tree File | Apple OS X | Apple |
| .BTV | Apple | Database Files | AppleTalk Desktop Database | macOS | Apple |
| .BTX | SmartWare Corporation | Database Files | SmartWare Backup Text File | SmartWare | SmartWare Corporation |
| .BW1 | Byteworx | Database Files | FMEA Database File | Byteworx FMEA | Byteworx |
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