| axb | Alpha Five Xbasic Script |
| axd | ASP.NET Trace Handler |
| axe | Annotated XML Example |
| axf | ARM RealView Compiler Object |
| axf | µVision Absolute and Executable Object |
| axml | Xamarin Android XML Layout |
| aya | Ayauhteotl Parser Data |
| b2d | Brutus2D Source Code |
| b3d | Blitz3D Data |
| ba | BSC Intermediate Object |
| bal | B4A Layout |
| baml | Compiled XAML |
| bar | BREW MP Binary Application Resource |
| basex | BaseX Data |
| bash | Unix Shell Script |
| baz | Zebra Printer Basic Source Code |
| bb | Blitz Basic Code |
| bb | GCOV BB Data FIle |
| bb2 | Blitz Basic Code |
| bbc | BBC Basic Source Code |
| bbf | ScriptBasic Compiled Binary File |
| bbg | GCOV BBG Data FIle |
| bbr | BlackBerry Native SDK Manifest Data |
| bdat | HP-UX Binary Data File |
| bdcm | Business Data Connectivity Model Data |
| bdcr | Microsoft Visual Studio BDC Resource Data |
| bdf | Altera Quartus II Block Diagram File |
| bdh | Silk Performer Script |
| bds | EasyC Project Data |
| bdsl | Boundary-Scan Description Language File |
| bdt | TAC Script |
| bdx | VisionICE Flat Binary Downloadable |
| beam | Erlang Compiled BEAM File |
| ber | ASN-1Step Basic Encoding Rules Data |
| bet | BETA Source Code |