app/code/local/Mage/Adminhtml/Block/Permissions/User/Edit/Tab/Main.php
inside: protected function _prepareForm() I added:
$form = new Varien_Data_form(array(
'id' => 'edit_form',
'action' => $this->getUrl('*/*/save', array('id' => $this->getRequest()->getParam('id'))),
'method' => 'post',
'enctype' => 'multipart/form-data'
)
);
However when the form is created and I inspect element it doesn't have the property of enctype="multipart/form-data"?