MIME, rich text, and text file attachment

I have a form with two rich text fields; one is a standand Notes RT, the other is checked to “Store contents as HTML and MIME”. In the Notes RT field I attach a text file with email addresses listed in it, and in the HTML/MIME field I type in rich text.

Once I have attached the text file, entered rich text, and saved the document, the following is appended to the text file:

“–=mixed 0063A28E87256EE0=–”

Why is this being appended to the end of the file? I am gathering the MIME information and closing the entity, and then gathering the attachment name and detaching it to the server to be read later.

Any ideas? Thx in advance.

adam.frost@eurorscg.com