Quartz: Improve a stub

[ivanleo at gmail.com]

It looks like someone was implementing some stuff and left it half way
through, so the result is GetClassMediaFile was hard coded to fail
because process_extensions always fails. This patch is needed by the
IAMMultiMediaStreamImpl_OpenFile which will follow. The two together
allow Crimson Skies to start and get to the menu instead of crashing.

ChangeLog: Improve a stub
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