.$#! is AOL virchk data
Key Features: .$#! File Extension
|Created by||America Online|
What is an .$#! file?
The $#! file extension is associated with applications developed by AOL Desktop and other apps developed by AOL (America Online).
The $#! file contains virchk data from AOL apps.
Seems to be obsolete.
This $#! 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.