Defender SmartScreen on Windows 11 Beta build 22581 apparently causes video playback issues

Despite not winning any of AV-TEST's Best Antivirus for Home Users awards, Microsoft Defender is considered one of the best on the market by the anti-malware review company. Defender also gets its thumbs up overall, although AV-Comparatives didn't impress.

Despite all the applause, Microsoft's antivirus solutions are far from flawless as they were recently, with Defender for Endpoint found to be flagging its own Office updates as malware and now reports of Defender SmartScreen In the latest Beta version, 22581 people came in causing video playback problems.

Several users on the Windows 11 subreddit running build 22581 reported lags in video playback. MKV is mentioned there, but other video container formats may also be affected. ISO apparently also faces this problem of delayed execution. The issue is not listed in the known issues of the build, which means it may have gone undetected during testing.

Reddit user kristijan1001 came up with a simple workaround for this issue, realizing that disabling the "Check Apps and Files" option under SmartScreen settings would resolve the issue. But before proceeding to apply this workaround, make sure that the file type is actually trustworthy.

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