Worksheets not retrieved

What steps will reproduce the problem?
1.Read attached XLS file (which was saved as MS Excel 97/2000/XP (.xls) by 
OpenOffice 3.3.0) with this php-excel-reader
2.Use something like this:
$data = new 
Spreadsheet_Excel_Reader('backup_categories_products-autovisu-20110125-3.xls',fa
lse,"UTF-8");
var_dump( $data );
3.

What is the expected output? What do you see instead?
It should have found 5 worksheets and store them in $data->sheets as an array. 
Instead, $data->sheets contains an empty array.

Please provide any additional information below.
The spreadsheet file can be read just fine both MS Office 2010 and OpenOffice 
3.3.0. So I assume this is a valid XLS file, and there is a bug in 
php-excel-reader.

Original issue reported on code.google.com by juergenn...@gmail.com on 25 Jan 2011 at 6:55

Attachments:

• backup_categories_products-autovisu-20110125-3.xls

Start with the Spreadsheet_Excel_Reader entry point and reproduce the report using the attached backup_categories_products-autovisu-20110125-3.xls file. Inspect why reading this valid XLS leaves $data->sheets empty, then verify that the five worksheets are stored in that array.