You can't attach anything to a Marketo email so this is a non-starter....
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What are you trying to accomplish? Sanford is right that you cannot attach anything to a Marketo email, but you can link to a hosted file. Maybe we can think of a work-around.
I hosted an OFT file in design studio to link in an email for the purpose of giving our distributors a pre-filled email to push to customers. In testing it was working for me except when the mail was forwarded. I did a real send to myself, however, and the file did not work properly.