: Use the "Combine files..." feature if you just want to merge them, though standard extraction is usually better.
Because this is part .002 , you cannot open it by itself. It contains only a slice of the full video. To access the mz13.mp4 file inside, you must: mz13.mp4.7z.002
: Right-click on the file ending in .001 . : Use the "Combine files
: Ensure you have every numbered part in the same folder (e.g., .001 , .002 , .003 , etc.). To access the mz13
To use this file effectively, you need a "useful feature" found in archive managers like or WinRAR called Volume Joining (or Extraction) . How to use this file
: Select "Extract Here" using 7-Zip. The software will automatically "stitch" all the numbered parts together to recreate the original video. Useful Software Features
The filename mz13.mp4.7z.002 indicates that this is the .