What worked for me, is i right clicked the UPROJECT file in the file explorer, and i set its default app to the UE4Editor.exe under the unreal install. (It’s just “UnrealEditor.exe” for UE5.6 and likely just UE5 versions in general.)
UE_4.27\Engine\Binaries\Win64\UE4Editor.exe
!!! BIG WARNING PLEASE READ !!!: If you switch engine versions, set the default back to the basic “Unreal Engine Version Selector.exe” located in \Epic Games\Launcher\Engine\Binaries\Win64. I do not want people possibly bricking their projects by forgetting to switch it back**.**
It also seems like a lot of people are having this issue and it might be due to a update to epics launcher, it almost certainty has to do with the unrealversionselector executable. Hopefully epic soon fixes this.