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This looks like a segmented file - Stuffit (and other utilities) can divide an archive into more than one file. You may have gotten one file, but not the other(s) that would complete the archive. I've never really done anything with segmented files, though, so I wouldn't know exactly what to do with it (if anything).
Delete the file, get the .bin of it or .hqx of it and decompress it again.
Chances are it will be fine.
That is normally the case - sometimes it means it is segmented, but usually not.
Its just corrupted, I think.