Bug?

My main application is installed to %AppFolder%
My application data must be installed here : %ProgramFilesFolder64%\ProductData

I must create the uninstaller and its folder in : %ProgramFilesFolder64%\ProductData\Uninstall

However, I think due to a bug if I set :

Uninstall files folder to %ProgramFilesFolder64%\ProductData\Uninstall
and
Executable path and filename to %ProgramFilesFolder64%\TruePianos\Uninstall.exe

After uninstall is finished, installer cannot load the background images of uninstall window (only for After Uninstalling).

Is this a bug?