Recently had to reinstall Windows. Installed UE4.13.2 to look at an older project I was working on. Everything worked flawlessly. Decided to downloaded the latest version and start a new project and it all worked fine, however, whenever I try to re-open the project from my Epic Games Launcher Library by double-clicking the project I get this error “This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel.”
I went into Default Programs and set the association to “C:\Program Files\Epic Games\UE_4.15\Engine\Binaries\Win64\UE4Editor.exe”. If I click on the .uproject in Explorer it works fine, but the Epic Games Launcher still gives me the same error. I tried restarting the launcher then I tried restarting Windows; no luck.
EDIT:
I found an answer elsewhere:
Take this file: “C:\Program Files (x86)\Epic Games\Launcher\Engine\Binaries\Win64\UnrealVersionSelector.exe”.
And paste it into “C:\Program Files\Epic Games\UE_4.15\Engine\Binaries\Win64” then double click it.
That fixed my problem.