Getting the ball rolling. Which VB6 projects are you working on?

[fafalone]

If you just want to disable navigation there's an EBO_NAVIGATEONCE once, which loads the initial folder you open it to, then doesn't allow navigating elsewhere.

Another option would be the OnNavigationPending event; you can return any error value to cancel the navigation. That way you could whitelist (or blacklist) folders rather than limit it to a single location.

And yes if you go to the OneDrive folder or any other similar online cloud folder, drag/dropping into it should upload, if that's what happens in Explorer (this is also true of ucShellBrowse).