There is a root view option in Windows Explorer, it can be enabled by starting Explorer like this:
explorer /e,/root,"d:\folder"
This will open Explorer with a folder list on the left, and you can only see "d:\folder" and its subfolders, nothing else (No Desktop, no local drives etc).
How to do that in Opus ? I can't find the command line to do this. And can't find an option to do this too.