Does not work with a specific .xls file

```
What steps will reproduce the problem?
1. Read an excel file

What is the expected output? What do you see instead?
Data of excel.
The filename /var/www/data.xls is not readable.

What version of the product are you using? On what operating system?
Latest currently available. CentOS

Please provide any additional information below.
It work with the example file.

Error occur at this point.
if (substr($this->data, 0, 8) != IDENTIFIER_OLE) {
$this->error = 1;
return false;
}

```

Original issue reported on code.google.com by `juslin...@gmail.com` on 4 Mar 2009 at 9:30

Start at the OLE identifier check shown in the report and compare it with how the example file is read. Reproduce with /var/www/data.xls on CentOS, if available, and inspect why this specific file fails while the example works. Done means the reported .xls file is accepted without breaking the existing example-file path.

Written by the indexing model from the issue text.