Fix #3868

Plain Craft Launcher 2/Pages/PageSetup/ModSetup.vb

@@ -86,7 +86,7 @@
         {"LaunchArgumentWindowHeight", New SetupEntry(480)},
         {"LaunchArgumentWindowType", New SetupEntry(1)},
         {"LaunchArgumentRam", New SetupEntry(False, Source:=SetupSource.Registry)},
-        {"LaunchAdvanceJvm", New SetupEntry("-XX:+UseG1GC -XX:-UseAdaptiveSizePolicy -XX:-OmitStackTraceInFastThrow -Dfml.ignoreInvalidMinecraftCertificates=True -Dfml.ignorePatchDiscrepancies=True -Dlog4j2.formatMsgNoLookups=true")},
+        {"LaunchAdvanceJvm", New SetupEntry("-XX:+UseG1GC -XX:-UseAdaptiveSizePolicy -XX:-OmitStackTraceInFastThrow -Djdk.lang.Process.allowAmbiguousCommands=true -Dfml.ignoreInvalidMinecraftCertificates=True -Dfml.ignorePatchDiscrepancies=True -Dlog4j2.formatMsgNoLookups=true")},
         {"LaunchAdvanceGame", New SetupEntry("")},
         {"LaunchAdvanceRun", New SetupEntry("")},
         {"LaunchAdvanceRunWait", New SetupEntry(True)},