Download helper, using force_download() - file corrupt after opening it

[eluser]zwadder[/eluser]
I had a problem with downloading xls files, they were corrupted. This did fix it: http://www.innovativephp.com/image-downl...ad-helper/
only added the ob_clean() part to the download_helper and it works now fine.
Only when there is an update I will lose it :-(