Quickform - File uploads

I've been attempting, with a little success, to use the 'file' element for QuickForm. Just a couple of queries: 1) I've noticed the documentation (such as it is) says that the upload functions are depreciated. Should I use some other method to upload and manipulate the file? Is there a PEAR class that replaces these functions? 2) I've attempted to add a rule to the file element: $form->addElement('file', 'xls_file', 'File:'); $form->addRule('xls_file', 'You must select a file', 'required'); but it doesn't work - it doesn't warn if no file has been selected using Browse. Is there another way to do this? 3) Does anyone know of a example of how the file functions work? I've scanned the internet to no avail. Any help would be appreciated. Leonie