Strangerke has demanded an update from me, so here it is. I fixed some Riven bugs and now the boiler puzzle is completable. The game is playable until the marble puzzle. Added support for changing Myst cursors and the Making of Myst. There were also various video fixes and support for audio support in Riven videos. Riven now shows the intro videos (though slightly out-of-sync). Expect gameplay videos soon.
That is all for now. :P