: Select the file, press Enter , and remove the redundant suffix. 3. Checking File Safety

: Right-click the file, select Rename , and delete the extra .mp4 so the file ends only in .mp4 . Ensure that "File name extensions" is checked in the File Explorer View menu to see the hidden extensions.

: A user might have typed ".mp4" when renaming, while the computer was already hiding the original extension.

: Use the VLC Media Player , which is known for its ability to play nearly any video file, even if the naming is slightly corrupted. 2. Fixing the Redundant Extension