| biar | Business Intelligence Archive Resource |
| bibtex | BibTeX Bibliography Database |
| bid | BidMaker Data |
| bidlist | Bulk Image Downloader List Data |
| bidqueue | Bulk Image Downloader Queue Data |
| bidule | Bidule Layout Data |
| bii | Basilisk II Data |
| bikey | Bohemia Interactive Key |
| bim | PLINK Extended MAP File |
| bim | Zemax Binary Image Surface Data |
| bim | GQT Variant Metadata |
| bin | Macbinary Encoded |
| binary | Generic Binary Data |
| binui | Call of Juarez Game Menu Data |
| biom | Biological Observation Matrix Data |
| bip | TSG Spectral Data |
| bis | Blaise Interview Specification |
| bit | Xilinx Bitstream Data |
| bit | DROPS Simulator Drillbits Data |
| biv | IsoBIVMV Data |
| bix | Biblook Index Data |
| bjf | NTI Backup Now Backup Job |
| bjg | DESQview Data |
| bjk | Blaise Database BJK Data |
| bjs | Moldex3D Batch Job Settings Data |
| bk0 | Aspen HYSYS Backup File |
| bk1 | FlashGet Database Backup |
| bk1 | Aspen HYSYS Backup File |
| bk2 | Aspen HYSYS Backup File |
| bk2 | FlashGet Database Backup |
| bk3 | FlashGet Database Backup |
| bk4 | FlashGet Database Backup |
| bka | Oracle Enterprise Manager OMS Backup Data |
| bkb | VariCAD Block File |
| bkj | Symantec Backup Exec Job |