: The .7z extension indicates that the original file has been compressed to save space or bundled for easier uploading. You will need a utility like 7-Zip or Keka to open it. Common Contents
While the specific contents depend on who created the archive, "M2U" files usually contain: M2U07_.7z
: If you see files named M2U00001, M2U00002, etc., these are simply the raw clips from a camera's memory card. How to Open It M2U07_.7z