How do I register an .exe in the installation?
By design, Microsoft Windows Installer does not self register .exe files. However, Wise has added a feature that uses a custom action to register files using custom code.
Or you can create your own custom action in the MSI Script, that calls the regsvr32.exe and registers the .exe. This custom action should occur after the InstallFinalize action in the Execute Immediate section of the script.