** .001**: This numerical extension indicates that the file is the first segment of a larger, split archive. The Mechanics of Multi-Part Files (.001, .002)
The "NEW" designation frequently suggests a "fix" in the video, such as better encoding, higher resolution, or the removal of, or addition to, previous edits. The Significance of Segmented Files (.001) MAXD 08 Aya Fujii The Dog Game 2 NEW.avi.001
If you have come across a file ending in .001, it is useless on its own. It is a fragment of a larger archive. To view the content, you generally need: such as better encoding