Haven't played in a year or so and brought a new PC with windows 10 and I can't open this at all, I've reinstalled java and launcher but still same problem. I will try and open launcher and it will open the cmd black box and close straight away with nothing, I then opened with javaw and it gave me this...

java.io.EOFException: encoding.error.not.xml
    at com.sun.deploy.xml.XMLEncoding.decodeXML(Unknown Source)
    at com.sun.javaws.jnl.XMLFormat.decode(Unknown Source)
    at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.Main.launchApp(Unknown Source)
    at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
    at com.sun.javaws.Main.access$000(Unknown Source)
    at com.sun.javaws.Main$1.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Also my files are .CLASS files and I don't remember if that's correct or not maybe they suppose to be .java?

I did the .bat solution and got error message: Error: Unable to access jarfile Launcher.jar