ReadAnyTextFile from IRBIS server

public static string ReadAnyTextFile
    (
        [NotNull] this IrbisConnection connection,
        [NotNull] string serverPath,
        [NotNull] Encoding encoding
    )
{
    Code.NotNull(connection, "connection");
    Code.NotNullNorEmpty(serverPath, "serverPath");
    Code.NotNull(encoding, "encoding");

    connection.RequireServerVersion("2010.1", true);

    string result = connection.FormatRecord
        (
            "&uf('+9J" + serverPath + "')",
            1
        );

    if (!string.IsNullOrEmpty(result))
    {
        RecordField field = RecordField.Parse("1", result);
        result = field.GetFirstSubFieldValue('b');
        byte[] bytes = IrbisUtility.DecodePercentString(result);
        result = encoding.GetString(bytes);
    }

    return result;
}