Despite failing to earn AV-TEST’s highest AV-Comparatives rating, Microsoft Defender is still one of the most suitable products on the market. Embarrassingly, in the Windows 11 Build 22581 compiled version, many people found that they encountered media playback problems. According to the discussion of Reddit users, the problem is related to the conflict of the Defender SmartScreen function that comes with the system.
In fact, Microsoft Defender antivirus software is still not perfect, such as Defender for Endpoint mistakenly flagged its own Office updates as malware. Now, Defender SmartScreen has brought video playback bugs to the latest beta test version of Windows 11.
On the Windows 11 Reddit subreddit, many netizens complained about video playback issues when using the Build 22581 build. In addition to the known MKV format, other container formats may also be affected by the “delayed execution” issue, implying a major oversight by Microsoft during the pre-release testing phase.
Fortunately, Reddit netizen kristijan1001 came up with a solution that works well – just disable “Check apps and files” under SmartScreen settings, and the video will play normally. However, before implementing this modification, please also ensure that the relevant files are downloaded from a trusted source, or use other reliable third-party virus protection software.