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Asked: 2026-05-10T19:07:11+00:00

I am reading WIX script written by others. There are some code really confuses

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I am reading WIX script written by others. There are some code really confuses me. 

<Custom Action='UnLoadSchedulerPerfCounters' After='InstallInitialize'>     <![CDATA[(Installed) AND (!Scheduler = 3)]]> </Custom> <Custom Action='RollbackSchedulerPerfCounters' After='WriteRegistryValues'>         <![CDATA[(&Scheduler = 3)]]> </Custom>

So, what’s the difference between !Scheduler and &Scheduler? Is any special meaning when property is prefix-ed by & or !?

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  1. From http://www.tramontana.co.hu/wix/lesson5.php#5.3:

    Prepending some special characters to the names will give them extra meaning:

    %     environment variable (name is case insensitive) $     action state of component ?     installed state of component &     action state of feature !     installed state of feature

    The last four can return the following integer values:

    -1   no action to be taken 1    advertised (only for components) 2    not present 3    on the local computer 4    run from the source
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