Problème Forge Installation

Normale?

C:\Users\Stéphane\Downloads>java -Djava.net.preferIPv4Stack=true - jar forge-1.9.4-12.17.0.1976
Unrecognized option: -
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
 
java -Djava.net.preferIPv4Stack=true -jar minecraftforge-installer-1.9.4-12.17.0.1976.jar

Il n'y a pas d'espace entre le - et jar. C'est compliqué de faire un copier/coller ?
 
C:\Users\Stéphane\Downloads>java -Djava.net.preferIPv4Stack=true -jar minecraftforge-installer-1.9.4-12.17.0.1976.jar
Error: Unable to access jarfile minecraftforge-installer-1.9.4-12.17.0.1976.jar