C.R.S. § 8-43-314

No fee shall be charged by the clerk of any court for the performance of any official service required by articles 40 to 47 of this title. On proceedings to review any order or award, costs as between the parties shall be allowed in the discretion of the court, but no costs shall be taxed against said director or industrial claim appeals office. In any action for the review of any order or award and upon any review thereof by the supreme court, it is the duty of the district attorney in the county wherein said action is pending, or of the attorney general if requested by the director or industrial claim appeals office, to appear on behalf of either or both, whether any other party defendant should have appeared or been represented in the action.