| awl | Siemens AWL File |
| ax | Modula-3 Linker Information |
| 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 |
| azcli | Microsoft Azure CLI Script |
| b | Modula-3 Base Program |
| b24 | Ovation Pro for RISC OS C Script |
| b26 | Ovation Pro for RISC OS Style Sheet |
| b2d | Brutus2D Source Code |
| b32 | Borland C Compiler Data |
| ba | BSC Intermediate Object |
| bacpac | Microsoft SQL Server DAC Exported Package |
| 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 |
