php - how to create excel file and read xls using php excel reader?

Question

Create excel file dataexcel.xls using php. dataexcel.xls file has more data. Then same dataexcel.xls file doesn't read php excel reader. Directly created .xls files are readable. But created excel file is not readable. I have used http://sourceforge.net/projects/phpexcelreader excel reader class.

header("Content-type: application/x-msdownload");
header("Content-Disposition: attachment; filename=dataexcel.xls");
header("Pragma: no-cache");
header("Expires: 0");

Any header content change?