I want to customize the Attach File button in Outlook to detect some text in the subject and have the InitialFileName be set based on what it picks out.

This is all actually done, but I'm adding my own button. The funny thing is I want to use the paperclip icon that everyone knows and loves as, but it is not a choosable icon when adding a custom button!

So, can I hijack when the default Attach File button is pressed and run my code instead? Or add the paperclip as a custom icon for my button?