I can't seem to find any way to change the icon for the OutFile and the Uninstall using Modern UI. I am using Version 2 Beta 4. Can somebody provide a code sample. Thanks.
You're probably trying to use Icon and UninstallIcon to change the icons. You should define MUI_ICON and MUI_UNICON. See the MUI readme for more information and the MUI examples to see where to define the MUI configuration.