We are taking the time to conduct thorough testing to ensure that re-enabling this protocol can be done without delay. 'We recognize that this feature is very important to many organizations and businesses. Microsoft has disabled the ms-appinstaller map in response to reports that the Emotet malware is exploiting a zero-day vulnerability that impersonates Windows AppX Installer, forcing users to download application packages to their devices before they can.
App Installer (also known as AppX Installer) allows users to install applications directly from a web server using an MSIX package or an App Installer file without downloading the installer to their computer first.
