How can I restrict certain file formats from being uploaded?

You can use the Manage Attachment File Formats setup task in the Setup and Maintenance work area.

Use this task to configure the file formats you want to restrict from being attached. Here's how you access the task:

1. In the Setup and Maintenance work area, click the All Tasks icon and click the Search link.
2. In the search field, enter Manage Attachment File Formats, then click the task link.