UE4/UE5 "Cannot double-click to open .uproject and click no response" solution

1. Method 1: Run UnrealVersionSelector.exe

1. Find the installation directory of Epic Game Lancher,

在lancher->Engine->Binaries->Win64->UnrealVersionSelector.exe

2. Copy UnrealVersionSelector.exe to the Engine->Binaries->Win64 directories of different versions of UE4 engines, such as UE_4.25->Engine->Binaries->Win64

3. Double-click to run UnrealVersionSelector.exe as administrator and restart the computer.
 

2. Method 2: Add environment variables

1. Computer/This Computer-Properties-System Properties-Environment Variables

2. Add a new user environment variable as follows:

Variable name: OPENSSL_ia32cap

Variable value: ~0x20000000

 

Save and apply.