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I'm sorry for the delay in responding to you. Those practice files are intended to be loaded and used with a PC and with Office 2007, not a Mac.
In the event you don't have a PC with Office 2007 on it to use the files, keep in mind that O'Reilly products have a 100% satisfaction guarantee, so if you are not completely happy with it (or in this case unable to use it), please let us know. Details can be found, here:
Customer Service Rep,