An oas file extension is related to the Fujitsu OAS document format. Probably obsolete format.
There is one other file type using
the OAS file extension!
.oas - Microsoft Outlook Attachment Sniffer data
OAS file extension - Fujitsu OAS document
What is oas file? How to open oas files?
File type specification:
The oas file extension is also used by some Japanese word processor for its document file format (Fujitsu OAS).
Most likely some old format without support. No further information could be found.
MIME types:
application/vnd.fujitsu.oasys
This oas 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.