Windows 10: .jar files "package unavailable"

I've recently tried to install forge for Minecraft but upon attempting to open the .jar file, I was met with "package unavailable". I then tried to reinstall the latest version of Java and the problems persisted. I've also tried to open other .jar files and they are unavailable. When trying to open them with WinRAR and the command prompt; No luck.

:)

 

.jar files not working

Hi Mohammed,

JAR (Java ARchive) is a package file format used to aggregate many Java class files into one file for distribution and is built on the
ZIP format. If you are having trouble opening these files, we suggesting reinstalling Java by following these steps:

• Open Settings from the Start menu.
• Select Apps, click on Java, then select
  Uninstall.
• Download and install Java from this link.

Let us know how it goes.

 

jar files

Fixing .jar file opening on Windows requires two steps:

• Open the Control Panel, and chose "Default Programs - Associate a File type or protocol with a program". Find .jar extension (Executable JAR file) there, and pick Java as default program to open this extension. It will probably be listed as "Java Platform(SE)".
  A faster alternative perhaps is straightforward right-click on a .jar file, and then change associated program by clicking on the "Change..." button.
• Now open the regedit, and open the HKEY_CLASSES_ROOT\jarfile\shell\open\command key. Luckilly for us, we may specify parameters there for the (Default) value. This is normally: C:\Program Files\Java\jre7\bin\javaw.exe" -jar "%1" %*

I Hope this Answers your Question!

 

.java to .jar file

As a side note to Easy Rhinos comment, you can only jar .class files, meaning that you need to compile all the .java files and them jar the .class files resulting from the compilation. Example:
Code: javac Test.java jar cf Teste.jar Test.class[/quote]