| bis | Blaise Interview Specification |
| bit | DROPS Simulator Drillbits Data |
| bit | Xilinx Bitstream Data |
| bitsboard | Bitsboard Board Data |
| biv | IsoBIVMV Data |
| bix | Biblook Index Data |
| biz | Microsoft BizTalk Compatible Schema Data |
| bjb | z/VSE System Binary Job Data |
| bjd | NDDigital Print Bureau Data |
| bjf | NTI Backup Now Backup Job |
| bjg | DESQview Data |
| bjk | Blaise Database BJK Data |
| bjl | BJL Business Systems Active Translation Data |
| bjs | Moldex3D Batch Job Settings Data |
| bjson | Binary JSON Data |
| bk | Movie Magic Screenwriter Document Backup |
| bk | Power Chess Book Data |
| bk0 | Aspen HYSYS Backup File |
| bk1 | Aspen HYSYS Backup File |
| bk1 | CA ERwin Data Modeler Backup |
| bk1 | FlashGet Database Backup |
| bk1 | Windows Indexing Service Data |
| bk2 | Aspen HYSYS Backup File |
| bk2 | FlashGet Database Backup |
| bk2 | Windows Indexing Service Data |
| bk3 | FlashGet Database Backup |
| bk4 | FlashGet Database Backup |
| bka | Oracle Enterprise Manager OMS Backup Data |
| bkb | VariCAD Block File |
| bke | BackupEarth Compressed Data |
