R5 MkII 8k video codec

Anyone using the R5 MkII for video? Shooting 8k video is restricted to using the XF-HEVC S format. But as near as I can tell, Canon has not released a codec for this format, so I am unable to open those MP4 files on Windows 11. Even the latest version of Canon's own DPP software is unable to import these files. Any suggestions on how to proceed?