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endasil

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Wix script, call function on already installed dll

If i have a dll included in my msi package, i can perform a custom action like:
<CustomAction Id="PerformMagic" FileKey="magic.dll" DllEntry="MsiDoMagic" Impersonate="yes"/>

But lets say i already have magic.dll installed on all computer that this installer is going to be applied to, is there a way i can perform a call to the existing dll instead of supplying it again?
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Vadim Rapp
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endasil

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You are right, i was not aware of the guidelines and tought of Excellent as a grade for an answer out of the ordinary and good as something that helped me solve the problem. Grade has been set to A according to guidelines and i apologize for not keeping myself informed.