That's definitely the way to do things ... the Java Plugin = kind of crappy. I always install the latest VM and turn off the plugin in preferences.

Alternatively, you can add a registry entry for .jar:

HKEY_CLASSES_ROOT/.jar (Default),REGSZ=jarfile
HKEY_CLASSES_ROOT/jarfile/shell/open/command (Default),REG_SZ= "C:\pathtojavaw\javaw.exe" -jar "%1"

pathtojavaw could be c:\program files\jemplode 2.0\jre\bin if you don't have Java installed in any other place

ms