Adam--of course DropStuff wouldn't work--you need to drop the files on StuffIt Expander (DropStuff compresses the .zip file into a .sit file). StuffIt Expander should easily open most zip files (I prefer StuffIt Expander to ZipIt for expanding archives, since Expander does everything automatically, depositing the archive contents in a new folder and leaving it neatly on the desktop--or whereever you tell your browser to place downloaded files). The folders then can be dropped on MacConverter, and it will convert--and combine .rsr files--with everything inside the folder.