@Brodie_McBeath there is actually nothing you can do, unless it was shared with one of your users with Edit rights!
If, and only if, the file is shared with one of your users with Edit rights, you can change the sharing.
If not, you (the admin) can do absolutely nothing.
Each individual user can go to their Shared with me view, and "delete" the file from their view, but they too can't affect the actual sharing.
There is no API for this, so no external tool can do it.
--
https://wheretofind.me/@NoSubstitute