Scroll down to the Video codecs section and Audio codecs section. For this, click on Help on the top menu bar of Windows Media Player, select About Windows Media Player, then Technical Support Information. To make sure that the problem is due to the missing codec, you may further check whether Windows Media Player includes the video or audio codec the file uses. However, if there is no specified codec information, you still need to switch to a third-party tool that can supply the file information. You should see the video/audio codec on the new Properties dialog. Add the video in the video library of Windows Media Player, under the Videos section, right click on the video, select Properties. Meanwhile, here is a way you may also give a try without asking for help from these tools: They can read the video information, check the video/audio codec, and even direct you to the sources where you can download the missing codec).

If you want to install a particular codec for playing a file on Windows Media Player, you need first know the exactly missing codec, which usually requires the help of third-party detector software (MediaInfo, VideoInspector, and Codec Installer are good options.

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