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Subject: Re: How to load a *.mat file in Windows XP, if the *.mat file was saved in Windows Vista
Date: Fri, 21 Nov 2008 05:31:02 +0000 (UTC)
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> The version on Windows Vista was 7.4.0 (R2007a)
> The version on Windows XP was 7.0.0 (R14) 2004

The problem may be that the older version of Matlab cannot read these files saved in a newer version.  I have both Vista and XP running 2007a and there is no compatibility issues at all.
If, in 2007a, you type:

help save

you will see that there is a switch

save filename -v7 

in 2007a which allows a saved file to be read in version 7.  You will have to use this switch in 2007a to load the file in 7.0