Thanks ,
There isn’t a verify option on the engine version dropdown; it only allows me to pick from the two versions (I have 4.13.2 and 4.14.0). I assume you are referring to the engine version dropdown menu on the Epic Games Launcher? It updated a week or so ago; that option may not be there anymore.
As for choosing Open With… to force it to run with Unreal Engine, I currently have it set up to use the 4.14 version of the Unreal Engine executable (black icon). The blue one is the 4.13 version. Neither works.