| bgt | Graphic Accounts Data |
| bh2pcm | eXtendable Wad Editor BH2PCM Data |
| bhd | Backup Exec Deduplication Storage |
| bhf | PCAnywhere Data |
| bhl | BlockHashLoc Data |
| bhm | BHM Hierarchical File Format Data |
| bho | Behold Organize Data |
| bhp | BHP Survey Tool Data |
| bhv | MicroStrategy Licensing Data |
| bhv | MonkeyLogic Behavioral Data |
| bia | ISaGRAF I/O Board Archive |
| 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 | GQT Variant Metadata |
| bim | PLINK Extended MAP File |
| bim | Zemax Binary Image Surface Data |
| bimd | Blue Ink Meta-data Export Data |
| bin | Macbinary Encoded |
| bina | Microsoft Word 5 for Mac Document |
| binary | Generic Binary Data |
| binui | Call of Juarez Game Menu Data |
| binx | Analyst BINX Data |
| bioexcess | BioExcess Protected Data |
| biom | Biological Observation Matrix Data |
| bionix | BioniX Wallpaper Playlist |
| bip | TSG Spectral Data |
| bis | Blaise Interview Specification |
| bit | DROPS Simulator Drillbits Data |
| bit | Xilinx Bitstream Data |