Need help opening .jar

[Quille]

Hello! I have recently purchased a new computer and cannot download Optifine or Forge. The issue I am having is that the Java program 'javaw.exe' does not seem to open .jar files for me. As far as I can tell, I cannot open .jar files at all. The trouble-shooting I have tried so far is that I have un-downloaded and re-downloaded Java and that has not fixed it. I have followed the pathway to 'open with->choose another app->choose an app on your pc->Program Files (x86)->Java->jre-1.8->bin. and from inside bin I have tried opening these programs with each and every java application in there assuming I may have been wrong about which one I need to use. Still no luck. From there I checked to make sure that Java was allowed through my firewall and have seen no instances of any application with Java in the name anywhere in the list of apps to let through fire wall. I'm unsure of what to try next, so I would absolutely love help figuring out why my computer is not letting me open .jar files. Specifically these ones that I know are meant to open as installers.

Any ideas are appreciated. Thanks in advance!

[Quille]

After more research I have found a program called jarfix. I used it and it fixed my issue. I'm not sure exactly what the issue was but this issue has been resolved.