I have discovered several sit archives that fail to extract in windows. The reason it the inclusion of mac icon resources in the archive, which are not extractable in the windows environment. I believe that this is because the files have a non-windows character, stuffit shows the file with a rectangle symbol that windows uses to represent "illegal character".
Please see (url="http://"http://home.earthlink.net/~ppfann/images/stuffit.gif")example here(/url)
I don't know if it is possible to simply avoid using these icon resources, or if they are put there automatically by the mac filesystem. But you may want to try to remove them for the benefit of your windows audience.
------------------
I think we're on the same page. Unfortunately, yours has a big 'F' on it. -(url="http://"http://www.homestarrunner.com/sbemail43.html")StrongBad(/url)
Get (url="http://"http://home.earthlink.net/~ppfann/")Mods for Windows(/url) here!