Ok, so I've heard a lot of tricks about launching Myst IV, like the "chmod a+x myst4" trick but none of them will work (It keeps saying "There's no such directory, and the cd_ command doesn't do anything). If anyone had any luck on this, could you please give me a step-by-step guide to fix this problem? I work on a MacBook, Leopard.

Take care. =)

Welcome to the Forums!

Take a look at:
-- Myst 4 on Intel iMac - Number 4's Alive! Wahey!!!
-- Macintel support for Myst IV and V
-- Myst IV on Mac and PC: how I overcame problems, but can't patch PC install

@Heimdall: It's been a long time and my memory is not very clear on the matter, but didn't Myst IV utilize 16 bit graphics? If so, there's probably something concerning newer MacBooks and that you should know about. Apparently these laptops use the Intel GMA X3100 graphics card, which cannot display thousands of colors, or 16 bit graphics. This has created quite a scream in the Mac community, because games that use 16 bit graphics will no longer display properly.

Of course, this might not be the problem, but I think it's worth mentioning.

Well it seems that the 3rd Heimdall's solution worked perfectly at last! Thankfully it's not crashing or everything, but just like you said, after the patch update, the scene are getting slower by 2 to 4 seconds, but that's ok. I'm utterly happy with it! Thank you Heimdall! : >

You're welcome. Enjoy Revelation!