C:\Users\PC1\Downloads>java -Xmx1024M -Xms512M -cp Minecraft.jar net.minecraft.L
auncherFrame
java.io.FileNotFoundException: C:\Users\PC1\AppData\Roaming\.minecraft\lastlogin
 (Le fichier specifier est introuvable)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(Unknown Source)
        at net.minecraft.LoginForm.readUsername(LoginForm.java:131)
        at net.minecraft.LoginForm.<init>(LoginForm.java:76)
        at net.minecraft.LauncherFrame.<init>(LauncherFrame.java:30)
        at net.minecraft.LauncherFrame.main(LauncherFrame.java:158)