If you aren't sure about a file, run it in a Virtual Machine or use a tool like "Windows Sandbox" to test it without risking your main system.
When searching for files with names like this, you are often entering the world of third-party mirrors. It is vital to stay safe: file plagueincevolvedv11910inclalldlc
A legitimate "All DLC" version of Plague Inc: Evolved should be roughly 500MB to 1GB . If the file you find is only 10MB or is an .exe under 100MB, it is likely a virus or an installer for unwanted software. If you aren't sure about a file, run