CEF over Unreal Engine - RF talk to windows


So we have an application, which is a 3D rendered using Unreal Engine, that has a user layer based in CEF. We can load files via the command line, which is what I’ve been doing thus far, however, I’d like to be able to load them via the file open dialog… Because its CEF the File Open dialog doesn’t actually talk to Selenium, so I have looking more at the win32gui library to try and identify the controls.

I was wondering if anyone had working code that does this? before I start down that journey.