Question
How do I call an .EXE that already exists on the destination computer?

Answer

1. Add the Execute Program from Destination custom action after CostFinalize.
2. The Execute Program from Destination dialog appears. Fill in the following information:
• Custom Action Name: Enter a any name (something that will explain the custom action).
• Working Directory: Browse to folder that contains the .EXE on the destination computer. (Example: INSTALLDIR.)
• EXE andCommand Line:  Enter an .EXE with path along and command line.  (Example: [INSTALLDIR]TEST.EXE.)
3. Click OK.
4. Ensure that a condition is placed around the custom action so it will not run when the installation is removed from the machine. See example below:
   
   If NOT Installed
      Execute Program from Destination
   End Statement