Determine build number of windows installation ISO/DVD

I have various Windows XP, 7 and 8 installation ISO/DVD's.

I would like to compare to see what is the latest build number.
I already know the version of Windows (ie home or professional) and what service pack they are, but I want to know what build number they are.
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Seth SimmonsSr. Systems AdministratorCommented:
here are build numbers
leo135Author Commented:

Im not sure I'm looking for that though.

Im looking for the actual build of the installation ISO/DVD.
I'm sure Mircorosft release more than one installation ISO/DVD for the same version of windows and there is a way to tell which one is newer
Seth SimmonsSr. Systems AdministratorCommented:
the only dvd and iso images available aside from RTM releases are with service packs
you might have a windows 7 iso; another iso might be windows 7 with sp1

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leo135Author Commented:
Thanks - I didnt realise that and thought there were releases besides for the service pack ones
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