A client is using an automated deployment system and wonders why our software does not create a registry key (GUID) in HKEY\SOFTWARE\Classes\Installer\Products. Their system relies on this key to verify that our software is installed. As far as I can find out this key is related to MSI. I have tried to create a MSI using #exe2msi, but still nothing appears in the registry.

I also tried to set the project to "Installer type: Microsoft Windows Installer (.MSI)", but it fails with "Compiler error: SetupBuilder Windows Installer (.msi) compiler (SBMSI) not available." According to the documentation this is "future functionality"?
The "Package GUID" on the MSI Info tab appears to be the GUID they are looking for.