In specific archival contexts, such as the Hard Zone MTV Russia collection on Internet Archive , this specific naming convention is used to organize full episodes of televised broadcasts. Recommended Descriptive Labels
The (1) indicates this is the second time a file with this name was saved to the same location. You may want to check your original 720.mp4 file to see if they are identical or different parts of a series. 720(1).mp4
The filename is a generic name typically generated by web browsers or download managers when a file named "720.mp4" already exists in your downloads folder. The "720" likely refers to the 720p HD resolution ( pixels) of the video. In specific archival contexts, such as the Hard