i have a mac. which program do i need to download to make pc games work on my mac? and, which applocation do i use to open said program?

you are talking about Piracy, please read the rules before post a thread

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Firstly, not all PC games are MAC compatiable. Before trying to d/l a "DEMO" or open source game be sure it is MAC compatible. LimeWire shares alot of free games made available by the companies themselves so not all is "PIRACY" like some seem to think. Infograme I believe distributes lots of games. Check the Manufactures website before downloading and check the Specs. You may even find the demo on their site.