This is because of the setting of the opening method, just set the opening method to other software.

Tools: computer.

1, open the computer, select a video file, select it and click the right mouse button.

2, after clicking the right button, in the pop-up menu, click open mode.

3, continue to click to select other applications.

4, select a video player in the list.

5, check Always use this app to open .MP4 files, and finally click OK.