Can't install MSI into Program Files folder
There's even a FIXME for that. https://gitlab.freedesktop.org/gstreamer/cerbero/-/blob/1.21.1/cerbero/packages/wix.py#L504
When you are browsing for a directory in the custom setup window, everything is all nice and dandy.. but when you press OK, "location" gets filled with the equivalent "Program Files (x86)" path.