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>But, back to the point, I have created all classes and forms according to your suggestions on chapter 12 and everything is working fine on VFP 7, but not on version 8. I have not even thinked about those FoxUser files, and can´t even remember where they are ... I´m on the way to try to find them :)

They should be HOME(7).

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>But, forgive my ignorance - what do those files have to do with the Crystal Preview object ?

They'll track information about the VFP form that you're using.