Ok, i can save the data that is in my xml in the registry. But i will need to
do that only the first time. 
How do i determine, if this is a first time install ( where i need to read
the xml file) for an advertise install where i need to read the registry. 

Should i just have my custom action check the registry first? If i do that,
what will happen on an uninstall/re-install. I need to to re-read the xml
file then.

Should i always write to the registry also, even if the values are already
there?

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