It's a copy-protect thing: BioWare knew there were bunches of people with BG1 out there, and if you could boot up ToSC with a BG disc, a group of friends could get together and just buy one ToSC disc, passing it around whenever anyone needed to actually GO to the ToSC areas. Hence, they decided to make Disc 6 required every time you start the program.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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