https://bugs.winehq.org/show_bug.cgi?id=34206
--- Comment #8 from Hugh McMaster hugh.mcmaster@outlook.com --- (In reply to winetest from comment #7)
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.
Did you mean HKCR instead of HKCU?
And it complains Unable to rename the New Key #1. The specific key name already exists.
That is expected. The key ".pdf" does already exist. You can see it in the long list of keys present in HKEY_CLASSES_ROOT.
I also tried adding a new key (".doc") to HKCR and closed regedit. I then waited a few seconds and reopened regedit. The new key was also present and visible.