Console snippet to check which runner version a gamemaker studio game might be exported to using UTMT.

UTMTGetVersionGuesstimate.csx

using System.Reflection;
FieldInfo ver = null;
foreach (var t in typeof(UndertaleData).GetFields())
{
    if (t.Name.StartsWith("GM") && (t.FieldType == typeof(bool)) && (bool)t.GetValue(Data))
    {
        ver = t;
    }
}

if (ver != null)
    return $"Likely: {ver.Name}";
return $"No guessed version, maybe GMS{Data.GeneralInfo.Major}.{Data.GeneralInfo.Minor}.{Data.GeneralInfo.Release}.{Data.GeneralInfo.Build}";