The file is the first part of a split 7-Zip archive . When large files (like high-resolution videos) are too big to transfer or upload as a single file, they are often split into smaller "parts" labeled .001 , .002 , and so on.
To access the videos inside, you must have of the archive and "join" them back together using extraction software. Requirements for Extraction How to extract part files 001 using 7zip on windows (2026) videos.7z.001