I was talking to a developer last night who said he thought that M$ was supposed to be releasing a "patch" to undo this. You have my sympathies (I have to use Eudora anytime I want to receive self-extracting files.)
http://www.gossamer-threads.com/...h_string=exe;#171255
http://www.gossamer-threads.com/...h_string=exe;#171255