It is useful to have an open to run Windows Installer files (*.msi) as administrator. There are some desktop apps which have issues installing correctly when UAC is enabled. Also, when you install an MSI package in a limited user account, it requires an elevated command prompt and a number of additional actions. To avoid this, you can add a context menu command for MSI files to the File Explorer app which will allow you to run the selected MSI file as administrator. Here is how.