The X
extension name file type Classification
B BASIC Source File developer files
B BuRg3r Definition File developer files
B Grand Theft Auto 3 Saved Game File game files
B1 B1 Compressed Archive Compressed file
B2A Btoa Encoded File encoding file
B3D Blitz3D Entity Model File 3D image file
B4S Winamp Playlist File audio file
B5I BlindWrite 5 Disk Image disk image file
B5T BlindWrite 5 Disc Track Information File disk image file
B64 Base64 MIME-Encoded File Compressed file
B6I BlindWrite 6 Disc Image disk image file
B6T BlindWrite 6 Track Information File disk image file
B6Z B6Z Archive Compressed file
BA Scifer External Header Archive Compressed file
BA2 Bethesda Softworks Archive game files
BA6 TaxAct 2016 Tax Return Backup File backup file
BA7 TaxAct 2017 Tax Return Backup File backup file
BA8 TaxAct 2018 Tax Return Backup File backup file
BA9 TaxAct 2019 Tax Return Backup File backup file
BAC Backup File backup file
BACKUP Android Backup File backup file
BACKUPDB Time Machine Backup Folder backup file
BAD Exchange Badmail File text file
BAFL BurnAware File List data file
BAK ACT! Backup File backup file
BAK Backup File backup file
BAK Bookmarks Backup File backup file
BAK Finale Backup File backup file
BAK MobileTrans Backup File backup file
BAK Terraria Backup File game files
BAK1 Starbound Backup File game files
BAK2 Backup File backup file
BAK2 Starbound Backup File game files
BAK3 Backup File backup file
BAK3 Starbound Backup File game files
BAKX Finale Backup File backup file
BAK~ AbiWord Auto-Saved Document backup file
BAND GarageBand Project File audio file
BAP Blaze Audio Wave Information File audio file
BAR Age of Empires 3 Data File game files
BAR Age of Mythology Data File game files
BAR Brew MP Binary Application Resource File data file
BARS Binary Sound Archive File game files
BAS BASIC Source Code File developer files
BASERPROJ DNA Baser Project File data file
BASEX BaseX Data File developer files
BASHRC Bash Non-Interactive Login Shell File System Files
BASH_HISTORY Bash History File System Files
BASH_PRO Bash Interactive Login Shell File System Files
BAT DOS Batch File executable file