All applications, beneficiary designations, administrative elections, petitions, complaints, replies, and other pleadings seeking to institute any claim, complaint, or other proceeding under the Act, relating to any such proceeding then pending (other than one that has become a "contested case"), or seeking to exercise a right or perform an administrative action under the Act shall be filed with the director at the offices of the system in Austin. Such instruments shall be deemed filed only when actually received, accompanied by the filing fee, if any, required by statute or by rules of the board. An instrument may be filed electronically in accordance with §107.9 of this title (relating to Electronic Filing of Documents). If a proceeding becomes a "contested case", documents shall thereafter be filed in accordance with §§101.16 - 101.22 of this title.