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https://docs.microsoft.com/.../microsoft-defender-smartscreen-overview

Microsoft Defender SmartScreen determines whether a downloaded app or app installer is potentially malicious by: Checking downloaded files against a list of reported malicious software sites and programs known to be unsafe. If it finds a match, Microsoft Defender SmartScreen shows a warning to let the user know that the site might be malicious. ...

https://support.microsoft.com/en-us/topic/what-is-smartscreen-and-how-can-it-help...

SmartScreen checks the sites you visit against a dynamic list of reported phishing sites and malicious software sites. If it finds a match, SmartScreen will show you a warning letting you know that the site has been blocked for your safety.

https://support.microsoft.com/en-us/office/what-is-smartscreen-and-how-can-it-help...

SmartScreen checks files that you download from the web against a list of reported malicious software sites and programs known to be unsafe. If it finds a match, SmartScreen will warn you that the download has been blocked for your safety. SmartScreen also checks the files that you download against a list of files that are well known and ...

https://docs.microsoft.com/.../microsoft-defender-smartscreen-set-individual-device

To use Windows Security to set up Microsoft Defender SmartScreen on a device. Open the Windows Security app, and then select App & browser control > Reputation-based protection settings.. In the Reputation-based protection screen, choose from the following options:. In the Check apps and files area:. On. Warns users that the apps and files being downloaded from the web are potentially ...