You cannot open these files with standard Windows or macOS zip tools. You need a dedicated utility:
: This usually means a part is missing or renamed incorrectly. Ensure the filenames are identical except for the .00X extension. mz13.mp4.7z.001
: Ensure you have every numbered part in the sequence (e.g., mz13.mp4.7z.001 , mz13.mp4.7z.002 , etc.). You cannot open these files with standard Windows
: Download the official 7-Zip tool (free and open source) or WinRAR. macOS : Use The Unarchiver or Keka . mz13.mp4.7z.001
: This indicates a corrupted download. Try downloading all parts again, or use a repair tool like Recoverit .
From the context menu, select (or your chosen tool) and click Extract Here or Extract to "mz13.mp4/" .