I haven't seen that problem before, but I know how to fix it. I'm not sure if you mean the level files or the .sit.hqx'es, so I'll tell you what to do for both:
If you can't open the .sit.hqx'es... change their extension to .sit. If they already are .sit, then find the actual application, Stuffit Expander, and drop the files to open on it. It should open them fine.
If you can't open the level files... somehow obtain a copy of ResEdit, if you don't have it already. From ResEdit, in the File menu, there should be "Get File/Folder Info..." as a menu item. Select that. From there, select the level file giving you problems. From there, in the Type: box, type Mwld, and in the Creator: box, type Msct.
If those don't work, post saying that. If they do, post saying that, too.
(edit)Oh, and one important thing I forgot. Welcome to the boards! (/edit)
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(This message has been edited by ferazel_09 (edited 05-28-2003).)