OK, so I can't run jar files of any sort on my windows 7 pc, the one in particular I'm trying to use is the forge installer for minecraft so an installer window should open when i double click the file. I have Java and I set it to open with Java (TM) SE Binary but all that does is make the command prompt window open and then close again instantly. I have tried using the command method to open it but then it comes up with the error saying Error: Unable to access jarfile runable_jar.jar. I have downloaded the JDK file because I heard that was something I needed, but I'm not sure where to put it so it will do what it is supposed to. Was there something else I needed to download or is there something wrong with the version of Java I'm using. By the way I have a windows 7 64 bit if that helps.

1 Answer 1


You must install the JRE to run java applications.

  • 1
    The OP already has Java installed.
    – bwDraco
    Aug 2, 2015 at 12:36
  • And Java includes the JRE
    – DavidPostill
    Aug 2, 2015 at 13:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.