Why does my Adobe Dynamic XML Form (*.pdf) submit as data.xml

[Nats1]

Hi, I have created a form and saved it as Adobe Dynamic XML Form (*.pdf)  the form used to submit perfectly via email but today it keeps attaching  to the email as in a data.xml format.  What would cause this and how do I fix it.

P.S. I am a novice with Livecycle

[Justin_Klei]

Check the properties on your submit button.  That is where you define the submission format.