Microsoft-windows-netfx3-ondemand-package.cab -extra -

Once you have the legitimate microsoft-windows-netfx3-ondemand-package.cab (extracted from an ISO or a trusted network share), you install it using (Deployment Imaging Servicing and Management).

System administrators use this file to "sideload" the framework onto corporate machines using DISM (Deployment Image Servicing and Management). Installation via Command Line Microsoft-windows-netfx3-ondemand-package.cab -Extra