By default, the version of Windows Media Player (WMP) included with XP does not natively support the modern MP4 format. However, you can "teach" WMP to play these files by installing a codec pack. Download official VLC media player for Windows - VideoLAN
Even though Windows XP is a legacy operating system, you can still play modern MP4 (H.264) files by choosing the right software. Modern players often drop support for older systems, but several lightweight and versatile options remain compatible. Best MP4 Players for Windows XP mp4 player xp download
Known for its high-quality playback, KMPlayer maintains support for legacy Windows versions and offers a wide range of customization options. How to Play MP4s in Windows Media Player By default, the version of Windows Media Player