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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .BCD | Microsoft Corporation | System Files | Windows Boot Configuration Data File | Microsoft Registry Editor | Microsoft Corporation |
| .BCS | The Wavelength | System Files | Batch Compiler Specification File | Batch Compiler | The Wavelength |
| .BEM | Open Source | System Files | Babel Enterprise Module | Babel Enterprise | Open Source |
| .BIO | IBM | System Files | BIOS File | Intel Integrator Toolkit | Intel Corporation |
| .BK1 | Autodesk, Inc. | System Files | Autodesk Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .BK2 | Microsoft Corporation | System Files | Windows Indexing Service File | Microsoft Windows | Microsoft Corporation |
| .BLF | Microsoft Corporation | System Files | CLFS Base Log File | Microsoft Common Log File System (CLFS) | Microsoft Corporation |
| .BMK | return7, LLC | System Files | BillMinder Backup File | return7 BillMinder | return7, LLC |
| .BOM | Apple | System Files | Mac OS X Bill Of Materials File | Echo One File Juicer | Echo One |
| .BPD | Palo Alto Software | System Files | Business Plan Pro File | Business Plan Pro | Palo Alto Software |
| .BSD | IEEE Xplore | System Files | Boundary Scan Description Language Data File | Microsoft Notepad | Microsoft Corporation |
| .BZI | GEEP EDS LLC. | System Files | Darik's Boot And Nuke Kernel Data | Darik's Boot And Nuke | GEEP EDS LLC. |
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