I'm pretty sure that Cider isn't for the typical consumer like you or me. Cider is for developers to use so that they can convert the applications that they've made to PC to run under OS X. Then they release a native OS X version (that they made with cider) and you buy it. I don't think you can simply use cider as a typical emulator.
For example, the mac version of Command and Conquer 3 is a cider game... and that means that EA used Cider to port the game, and now you can go buy C&C 3 for mac. If you buy the PC version though, don't expect to be able to port it with Cider yourself.