A boa file extension is related to the BOA Constrictor Archive format. Probably obsolete.
BOA file extension - Compressed archive
What is boa file? How to open boa files?
File type specification:
The boa file extension is used for some sort of compressed archive created by the BOA Constrictor Archiver.
Most likely some old format without support. No further information could be found.
This boa file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.