Connecting Infopath form to Sharepoint Access Database

Hi, I was wondering if you could create a form based on a Access database I have put in a document library on a sharepoint website. When I try to create a infopath form based on this, when it says select database i put in the url: http://207.245.47.37/sites/Safety_and_Training/ai3/db1.mdb but it says that “An unspecified error occurred while attempting to connect to the data source. Infopath only supports SQL and Access databases”. This is weird because the database is clearly a mdb file format.

Does anyone know why this is happening?