To play MP4 files in Windows Media Player (WMP), you need specific software components called codecs that decode the video and audio data. While modern versions of Windows often include basic support, many MP4 files use advanced encoding—like H.265 (HEVC) or specialized audio—that requires additional downloads. Step 1: Enable Automatic Updates

On the tab, select Once a day or Once a week under Automatic updates .

If automatic updates do not work, installing a comprehensive codec pack is the most reliable solution.

Before downloading third-party software, check if Windows can automatically retrieve the necessary codec: Open Windows Media Player.

Basics about videos and video codecs in Windows Media Player

Check the box for and click OK . Step 2: Download a Trusted Codec Pack

Go to > Options (press Ctrl + M if the menu is hidden).

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