public void ReadVersion()
{
string version = ReadStringByteLength(30);
if (!version.StartsWith("FICHIER GUITAR PRO "))
{
throw new UnsupportedFormatException();
}
version = version.Substring(VersionString.Length + 1);
int dot = version.IndexOf('.');
_versionNumber = (100 * Std.ParseInt(version.Substring(0, dot))) + Std.ParseInt(version.Substring(dot + 1));
}