run this in the tools/Opus CLI/Ad-Hoc Script Editor
function GetScriptEngineInfo()
{
var s= "";
s += ScriptEngine() + " Version ";
s += ScriptEngineMajorVersion() + ".";
s += ScriptEngineMinorVersion() + ".";
s += ScriptEngineBuildVersion();
return(s);
}
DOpus.Output(GetScriptEngineInfo());
on windows 11 24H2 you should get JScript Version 11.0.16384
which is a 2024 update to the JScript engine compliant with ECMAScript 2024, otherwise it will be JScript Version 5.something
which is a 2009 version.
I think we use this as first line to use the older version
// !JSCRIPTVER=3