Once the extensions are installed, try setting your preferred app as the default option for MP4 and check if the issue is resolved. Follow all the on-screen instructions to proceed and hit Install.Keep all the default settings and click Next.Choose a preferred video player and click Next.Once the file is downloaded, double-click on it to launch it.Click on the Download button for the Standard codec.Launch your browser and head over to the K-Lite Codec Pack page.Once they are re-registered in Windows, you can select an app as the default MP4 program on Windows 11. You can use a third-party source to download all the missing files if this is the case. The issue can also be caused due to missing file extensions in the system. That is it! The targeted app should now be the default program for MP4 files on your Windows 11 PC. Select the app that you want to make as your default MP4 program, and then choose Always use this app to open MP4 files option.Right-click on it, and choose Open with > Choose another app.Once the app has been reset, launch File Explorer and navigate to any video file (do not open it).Follow the on-screen instructions to proceed and wait for the process to complete.Note: You can also try to uninstall the program as many users reported that uninstalling this app fixed the extension problem they were facing. Scroll down to the Reset option and hit the Reset button.Click on the three dots associated with it and choose Advanced options.In the following window, scroll down to locate Movies & TV.
Choose Apps from the left pane and click on Apps & features in the right side of the window.Ĭhoose Apps & features from the left pane.Press the Win + I keys to open Windows Settings.Below, we have discussed the steps of doing so in detail: If this scenario is applicable, you can resolve the problem by resetting the Movies & TV app via Windows Settings. The corruption issue in this app was preventing the system from selecting another app as the default choice. One of the most common reasons behind the following error was a corrupt Movies & TV application (also known as Films & TV). This problem typically occurs when the system is missing important file extensions or dealing with a corruption error. In some Windows 11 computers, the users cannot set a default app for MP4, and the issue causes them to select a preferred app each time they want to play footage on Windows 11.
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