Hyperlinking Help In MS Office

[mbye]

I want to have a hyperlink that sends an email to "emailaddress@name.com", provides a subject "My Subject" with body text "My Text" and attaches a certain file which never changes "My File". I can do everything except the attaching part with the edit hyper link menu in office. Here is the Office hyperlink menu:

E-Mail Address:
mailto:emailaddress@name.com

Subject:
My%20Subject%20&body=My%20Text

What do I add the the subject to attach "My File"? Please help.