Hi, I want to verify the directory the user entered in the UI exists. I created a custom action with DTF (Thanks Jason!) that works. However, my understanding from this thread http://tinyurl.com/6ovukx is that; "The context/handle is different from within DoAction ControlEvent rather then sequenced CA. MsiProcessMessage calls won't work." My testing confirms this. Is there any reasonable (not "an async CA using an RPC mechanism") way to do this check during the UI phase of install? Right now, I put my CA early in InstallExecuteSequence, but this is pretty ugly.
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