M5.7z.001

: Use the free 7-Zip utility. Right-click the .001 file and select "Extract". macOS : Tools like The Unarchiver can handle split 7z files. Android : Use apps like ZArchiver or RAR .

: Ensure you have all numbered pieces from the same set in one location. Use extraction software : M5.7z.001

The file is the first part of a split compressed archive created with 7-Zip . What It Represents : Use the free 7-Zip utility