https://bugs.winehq.org/show_bug.cgi?id=34206
--- Comment #7 from winetest@luukku.com --- Actually I can see some problem. Comment 2 says to create a file/directory called ".pdf"
I went to HKCU --> New key --> ".pdf" without quates.
And it complains Unable to rename the New Key #1. The specific key name already exists.
fresh wineprefix wine 2.8-git.