.$o1 is MS-DOS pipe
Key Features: .$O1 File Extension
|Created by||Microsoft Corporation|
What is an .$O1 file?
The $o1 file extension is related to the MS-DOS operating system for IBM-PC computers.
Command pipe in DOS redirecting a programs output to a text file with file extension .$o1. Often used by debugging programs.
This $o1 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.