http://bugs.winehq.org/show_bug.cgi?id=824
--- Comment #13 from Michal Piaskowski piaskal+wine@gmail.com 2008-01-05 06:33:40 --- I tried writing a test which creates some registry values with RegSetValueEx and then reads it with RegQueryValueEx but it doesn't reproduce the bug.
It's because wineserver stores all registry data in memory and only saves/loads it when starting/stoping and the bug is related to the way REG_MULTI_SZ is stored in system files, so it can't be reproduced in a single test without forcing wineserver to restart or reload registry data.