https://bugs.winehq.org/show_bug.cgi?id=51063
--- Comment #11 from Robbert van der Helm mail@robbertvanderhelm.nl --- This particular issue (related to commit 04a8213) where the plugins just wouldn't be able to find their sample libraries at all has been resolved. At least a couple releases back these plugins still seem to spuriously report that they can't find their sample libraries for some people with reinstalling everything to a clean Wine prefix being the only solution I've found, but I've never tried figuring out what exactly is causing that.