http://bugs.winehq.org/show_bug.cgi?id=20059
--- Comment #14 from boskar bozkar@gmail.com 2010-05-24 10:32:53 --- Created an attachment (id=28240) --> (http://bugs.winehq.org/attachment.cgi?id=28240) WINEDEBUG +MSI, wine no crash, unpatched 1.2-rc1, compiled by me msiexec /p
WINEDEBUG=+msi msiexec /p /full_path_to_msp_extracted_from_sp1_and_sp2/*.msp
Hope it helps. As i noticed msiexec /p /path/* tries to use only one of files located in /path/, but it's another problem i think.
I suppose the msiexec /p way is the best to debug because debug output is free of unrelated with patching stuff.