How to recognize if unstall executed as result of installing new version

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Jul 24, 2008
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I have custom action which should be executed when application is uninstalling but should not if uninstall executed as result of installing new version. I have try different combinations of msiexec parameters but seems that if unistall executed internally from new installion it do not recive command line arguments. May be you may suggest anything?
Thanks in advance.
 
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