I am working on a client site and they would like to use WF-Channel to create pages containing links to downloadable documents. Since there is minimal internet savvy among those who will be using the site, we'd like to make it so that they can upload the documents (mostly .doc, .rtf, and .pdf files) to the images directory using the same dialog that allows for upload of HTML files. The module does not allow this, however; ir rejects these files as being the wrong MIME type. How would I go about modifying the module to accept .doc, .rtf, and .pdf files?