I can run .jar files through cmd, but I cannot double click them

Question

First, I am studying Java, but I am still very new to it, so complicated code will go over my head.

When I download a .jar file to say install a mod to minecraft and

Answer 1

Just to reiterate - Meghan's answer fixed my problem of not being able to double-click to start a jar in Windows 7.

• Open Registry editor

• Navigate to HKEY_CLASSES_ROOT->jarfile->shell->open->command

• Modify (Default) to "[Path to working JRE]/bin/javaw.exe" -jar "%1" %*

• Make sure .jar files are opened by [Path to working JRE]/bin/javaw.exe by default