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Try yourself.
To be honest, WPKG doesn't support such checks yet (it can't expand %PROGRAMFILES%).
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Just to make people aware of the changes in recent WPKG versions, environment variable expansion is supported for many attributes now, so the above check will work with the latest version.
== Why not use the MSI version? ==
Problem is, that if you have old exe-based installations, you will see them twice under Software (the same problem like 7zip).
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You will just have to remove the exe-based installed version similar to the 7-zip package.
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