not reading xls file (reading xlsx file correctly)

I have tried reading xls file with this library, it is simply not reading those files.

If I save those file in xlsx format. It reads without any problem.

The error it is throwing is like below.
SimpleXLSX Object
(
[workbook:SimpleXLSX:private] =>
[sheets:SimpleXLSX:private] => Array
(
)

[hyperlinks:SimpleXLSX:private] =>
[package:SimpleXLSX:private] => Array
(
[filename] => 456.xls
[mtime] => 1359738455
[size] => 17408
[comment] =>
[entries] => Array
(
)

)

[sharedstrings:SimpleXLSX:private] => Array
(
)

[error:SimpleXLSX:private] => Entry not found: _rels/.rels
[datasec] => Array
(
)

)

Please do needful. How can I solve this issue.

Don't try open XLS, this class used to read XLSX

Hi, i have problem in reading xlsx file with UNIX codepage
example http://www.okko.ua/index.php/exportExcel?object_type=1

Your content in sheet 4

print_r( $xlsx->rows(4) );

Tnx!