http://bugs.winehq.org/show_bug.cgi?id=26865
--- Comment #7 from Ken Sharp kennybobs@o2.co.uk 2012-07-01 13:19:05 CDT --- In Windows 7:
WinRAR --> 7-zip WinRAR extracts the files to a temporary directory and 7-zip adds them.
7-zip --> WinRAR 7-zip extracts the files to a temporary directory but WinRAR cannot find them and fails.
So I tried simply dragging and dropping a regular file (one outside of an archive) from 7-zip to WinRAR and this works fine.
So, I think, both work fine in Windows 7. I think I was over-complicating the matter anyway.