Did you download it off the net? There are reports that some pirated versions have corrupt resource entries. SCI Studio 2 will open up corrupt games (SCI Studio 3 is strict and only loads correct games). If you load it up in SCI Studio 2, you should see corrupt entries such as picture resources stating package#45 and such.
I suggest getting an original copy off eBay, the collection series are great because you won't need to worry about old floppies.