IIRC, didn't the various releases of SH use QuickTime to run their videos? Also, as you pointed out, QT is often installed as part of some software programs, games in particular, as a matter of course, and, often as a requirement to run the main software. There may be a lot of people out there who have QT on their machines and either not be aware of the installations or have forgotten about its existence...
If you need a workaround for QT, installing any of the various good media players will do; just change the preferred file association to the new player instead of QT...
<O>
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