: Use the "Join" function and select the .001 file as the input.

To view the video as a whole, you must reassemble the parts:

: Official standards, such as those from NASA , dictate that video files should use the H.264 codec within an MP4 wrapper for universal compatibility. How to Join and Play .001 Files

: Right-click the .001 file and select "Extract Here." The software will automatically detect and join the subsequent parts.

: If a part is missing or corrupted, the file will not join correctly.

: Ensure every numbered segment (001, 002, 003, etc.) is in the same folder. Use a File Joiner :

: The first part ( 001 ) often contains the essential header information required for media players to recognize the file format.