Any person, partnership, association of persons or corporation engaged in the manufacture and/or distribution of motor vehicles, whether resident or nonresident of the State of Mississippi, transacting the business of manufacturing, distribution, or sale of motor vehicles or the parts or accessories thereof in the State of Mississippi, shall file in the Office of the Secretary of State the form of a contract which is to be entered into between such manufacturer with its agent, dealer or representative in this state. Upon the approval by the Attorney General of the contract, the contract shall become binding on all parties thereto. The failure to file the contract with the Secretary of State as provided herein and to secure the approval thereof of the Attorney General of the state, shall render the contract unenforceable. This section shall not apply to dealers or manufacturers of motor homes governed by the provisions of Sections 63-17-201 through 63-17-221.