Renaming Div2 exe to Oblivion.exe makes no sense. It will only have an impact on applications that "know" oblivion.exe and those apps will then do things differently when an exe is called oblivion.exe It would be better to teach those applications what Divinity2.exe is and how it should react to that.
Divinity2 is not an Oblivion mod or something. Okay, so both use Gamebryo, but our Gamebryo is different from Oblivion's. It is just the core engine. Everything around it has nothing to do with each other...