Yes, I would say there’s something suspect there. Our generated solution shouldn’t contain any solution platforms named ‘x64’, so I’m not sure how you’ve ended up with that. Have you perhaps added a third-party project to the solution?
A non-editor build can certainly cause your .generated.h files to be written out in the location you ended up finding it in. Yet you shouldn’t be able to run the editor in a non-editor build like ‘Development’ (should be ‘Development Editor’).
It looks like something has got entirely confused. I can only suggest deleting your project’s Intermediate folder, regenerating the solution/projects and trying again. And sticking to the Development Editor/Win64 configuration if you want to run the editor. I’m still not sure how you managed to get Development/x64.
Post back here if you continue to have problems.
Steve