Thanks Friedrich. Hadn't thought of that! I am missing the OR operator though (and AND but that isn't a problem) as I use them a lot. Do you have a similar whizo solution to that?

Also, I've noticed that, in my partially completed app, the 'Ready to Install' dialog displays the [INSTALLDIR] compiler variable value in the 'Current Settings>Destination Folder' value, and not the actual folder selected in the 'Select Install Folder' dialog.