Dan Kegal sent this to the Wine-Devel mailing list today.
Johan Dahlin sent in a patch to add msxml6, and said "It's enough to make msi2xml.exe to at least start-up (before failing in msi later)."
Tom Wickline some time ago sent in a suggestion for
adding riched30. I didn't know any apps it helped, but apparantly Novell thinks it helps Groupwise a bit.

