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I need to validate data - some registry keys, some checks before the pre-requisites screen pops up , is there any built-in function to achieve it

My requirement is pretty simple - Need to check for the registry key , check whether its value is "x" or "y".If key contains either of the 2 values continue else exit the installation.I tried it using Pre-requisites editor but it doesnot provides th...

Is is possible to modify the pre-requisites dialog box? I did find to find the dialog box in the dialog-box list but was unable to find?