[wix-users] Run my msi on change mode.

[Nir Bar]

WixUI_InstallMode is only relevant when you use the MSI UI.You can condition custom actions on feature state and action to determine whether or not you're on initial, change or remove scenario.
See https://msdn.microsoft.com/en-us/library/windows/desktop/aa368012(v=vs.85).aspx





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