B4 files are typically part of a sequence of
files， often working in conjunction with other files in the same set such as B1， B2，
or B3 files. These segmented formats were commonly used during a time when storage devices were limited in size， and software needed to break
large applications or archives into manageable pieces.
This technique allowed for file transfers across floppy disks， early CDs， or low-bandwidth networks.
Today， many of these file segments remain in long-term
storage archives or institutional backups. While the
format may be outdated， the information inside the B4 file can still hold
operational value， legal importance， or historical relevance.
FileMagic makes it possible to open and review these
files quickly， even when the complete archive is not
available， giving users access to data that would otherwise be locked away in an unreadable state.