Hmmm... I thought the roster.dat file *was* critical. Far more than the .avi files... you can just uncompress them again if needed.
I believe that roster.dat holds your base character information. Without that, your characters may not actually exist... 
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*B*
Save Early, Save Often Save Before, Save After
Two-Star General, Spelling Soldiers
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Give 'em a hug one more time. It might be the last.
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