I believe the application was tested on Windows XP Pro only. So they can say it will function properly on Windows XP Pro. Since it was not tested on Windows XP Home, they cannot say it will run without problems on Home. Still, it may run without problems.
But as I remember, this was the same way for ArchiCAD 9.
As far as I remember, no error report was made since AC9 came out where it turned out Windows XP Home is the problem.
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