| axt | Microsoft Autoroute Trip Template |
| axtr | Microsoft Dynamics AX Task Recording Package |
| axw | Analyzer StateForms Data |
| ayat | Ayat Data |
| ayc2 | CS-80V Data |
| ayt | Ayat Data |
| ayu | AY Paste Data |
| ayy | FSUTMS Binary Transit Plotting Model |
| az! | Vuze Partial Download |
| azd | Amazon Software Downloader Data |
| azf | AirZip FileSECURE AZF File |
| azk | DMDX Output Document |
| azl | Amazon Kindle Data |
| azm | BTS Master AZM Map Data |
| azs | AirZip FileSECURE AZS File |
| azt | AutoZilla Template File |
| azz | AZZ Cardfile Database |
| azzx | Uncompressed AZZ Cardfile Data |
| b | LILO Boot Loader Image |
| b1 | VTrain Data File |
| b1j | BookJones Data |
| b2 | VTrain Box Data |
| b2 | VTrain Data File |
| b2 | VTrain Vocabulary Trainer Data |
| b2a | Btoa Encoded File |
| b2f | RISC OS Windows Metafile |
| b3 | VTrain Box Data |
| b3 | VTrain Data File |
| b3 | VTrain Vocabulary Trainer Data |
| b3d | Blitz3D Object |
