https://bugs.winehq.org/show_bug.cgi?id=43423
--- Comment #11 from Vincent Povirk madewokherd@gmail.com --- Turns out the existing values are created by _SHGetProfilesValue, called by _SHExpandEnvironmentStrings. So, I guess we could do it that way, and default to the path of FOLDERID_ProgramData.
FOLDERID_ProgramData is already stored in the registry, so we can change the default for new prefixes, separately.