Microsoft compressed file
File type: Archive and compressed file
The BI$ file extension identifies a compressed data file associated with a compression format developed by Microsoft.
File type category:
Archive and compressed file
Date updated: October 2, 2026
The BI$ file extension is associated with older applications or operating system components developed by Microsoft. A BI$ file stores compressed data for use by the related software.
The BI$ compression format appears to be obsolete, and Microsoft no longer provides current support for it.
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