https://bugs.winehq.org/show_bug.cgi?id=25681
--- Comment #9 from Jacek Caban jacek@codeweavers.com --- (In reply to Alistair Leslie-Hughes from comment #8)
Its appears that mime types have an extension defined, so lets try to use that to work out the CLSID.
Thoughts?
It may be correct, depending on what Windows does. It needs testing.