Hi,
Either the .mid or .not file would be fine.
To attach one (or both) files,
1. click on the "Paperclip" button at the top of the Reply box when you start a reply. A dialog will open for managing attachments.
2. Click one of the "Browse" buttons, and find the file on your computer. Then click "Open" in the lower left of that box.
3. When you're done finding the file(s), then click the "Upload" button. When you done, you can click the "Close this window" text, or the red "X" in the upper right corner.
4. If you want to insert the attachment(s) in some special spot in your reply, you can click the down-triangle/arrow next to the Paperclip button, and select the attachment that you want insert at that point.
ttfn,
Sherry