http://bugs.winehq.org/show_bug.cgi?id=32627
--- Comment #2 from Asif Ali Rizwaan fast.rizwaan@gmail.com 2013-01-04 20:09:17 CST --- (In reply to comment #1)
Are you sure your wine version is 1.5.20? The mentioned DoEnvironmentSubstW function is implemented since 1.5.19.
I can confirm there is a problem using the installer but it's not the same as you are seeing.
Sorry, thought fedora-update-testing was enabled, I had wine-1.5.18; just upadted to 1.5.20; error is "Internal error occurred"