An osi file extension is related to the SunNet OSI description format.
There is one other file type using
the OSI file extension!
.osi - Osiris database
OSI file extension - SunNet OSI description
What is osi file? How to open osi files?
File type specification:
The osi file extension is associated with the SunNet software, developed by Sun.
The osi file stores OSI description used by SunNet program.
Seems to be obsolete. Sun was acquired by Oracle.
This osi 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.