B File Extensions
File extensions that start with the letter B
| Extension | File Type | File Description |
| .bac | Backup | Backup File |
| .bak | Backup | Backup File |
| .bas | Developer | BASIC Source Code File |
| .bat | Executable | DOS Batch File |
| .bbs | Text | Bulletin Board System Text |
| .bck | Backup | VMX Backup File |
| .bcm | Backup | Microsoft Works Communications Script Backup |
| .bcp | Developer | Borland C++ Makefile |
| .bdb | Backup | Microsoft Works Database Backup |
| .bdf | Font | Glyph Bitmap Distribution Format |
| .bh | Compressed | BlakHole Archive |
| .bib | Text | Bibliography |
| .bic | Game | Civilization 3 Scenario |
| .bin | Compressed | Macbinary II Encoded File |
| .biq | Game | Civilization 3 Scenario |
| .bix | Game | Civilization 3 Scenario |
| .bkp | Backup | Backup File |
| .bks | Backup | Microsoft Works Spreadsheet Backup |
| .blend | Image | Blender 3D Image |
| .blu | Plugin | FileMaker Pro Runtime Extension |
| .blz | Image | Compressed Bitmap Graphic |
| .bmf | Image | Binary Material File |
| .bmk | System | Help Bookmarks |
| .bmp | Image | Bitmap Image |
| .boo | Compressed | Booasm Compressed Archive |
| .box | Data | E-mail Mailbox |
| .bps | Backup | Microsoft Works Document Backup |
| .btf | Image | NationsBank Check Images |
| .btif | Image | NationsBank Check Images |
| .buf | Misc | Buffer File |
| .bundle | Plugin | Mac OS X Application Plug-in |
| .bup | Backup | Backup File |
| .byu | Video | Brigham Young University Movie |
| .bz | Compressed | Bzip Compressed File |
| .bz2 | Compressed | Bzip 2 Compressed File |