http://bugs.winehq.org/show_bug.cgi?id=17524
--- Comment #30 from David Eccles (gringer) winehq@gringer.org --- *cough*
Repeating myself again (and again in response to one of your posts) to get the point across -- you need to download the exact version 7z package *(not the installer)* and run from the extracted directory. Until you mention you've used the executable from the 7z version, I don't see any reason to retest and will assume this bug still exists.
See original description, comment 22, comment 27.