How to Scan a File or Folder for Malware with Microsoft Defender on Windows 10 Share July 11, 2020 Dm4r Technology On Windows 10, Microsoft Defender (formerly called “Windows Defender”) always scans files before you open them unless you’ve installed a third-party antivirus. You can also perform a quick scan of any file or folder, too. Here’s how. Read This Article on How-To Geek › Source : How to Scan a File or Folder for Malware with Microsoft Defender on Windows 10