[WiX-users] How to write conditions for 'Change' mode

[little.forest]

Hi all,

We have a customaction:
          <Custom Action="DoDllRegistration" Before="InstallFinalize" >(Not 
Installed) AND (&amp;Feature_XYZ = 3)</Custom>

This works in initial install, but not in 'Change' mode. 

>From 
here(http://windows-installer-xml-wix-toolset.687559.n2.nabble.com/InstallMode-Conditions-DON-T-work-td707286.html
 ), I learnt that "there is no such standard property", and "See "Examples of 
Conditional Statement Syntax" for how you should do it. "

So I googled and found 
this: http://wix.mindcapers.com/wiki/Conditional_Inner_Text.
 <!-- Run on initial install, repair and minor upgrade --> <Condition 
Message='Blah'>COMPANYDIR AND NOT REMOVE ~= "ALL"</Condition>
Even if it doesn't say 'Change' mode, I still gave it a try. This statement 
seems working in 'Change' mode:
          <Custom Action="DoDllRegistration" Before="InstallFinalize" >(NOT 
REMOVE ~= "ALL") AND (&amp;Feature_XYZ = 3)</Custom>


So the question is, is this the right thing to do? Is there any potential risk 
that could blow our current stuff?
How to write the correct condition for initial install and 'Change' mode?

Thanks!

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