During the course of an investigation of a complaint and following the filing of a petition, respondent shall have access to all material in the files of Bar Counsel pertaining to the pending charges that are neither privileged nor the work product of the Office of Bar Counsel. Respondent may, upon two days' notice, orally request access to such files. Any dispute arising under this chapter shall be resolved, after the filing of a petition, by the Hearing Committee Chair upon written application by respondent.