Date: 2023sep18 Q. Visual Studio 2017: RCXDTI.DLL is required to compile DESIGNINFO resources A. That DLL is missing. Some .rc's install a DESIGNINFO block which is optional. But its better to get that DLL back. I fixed this problem by refreshing my install. I searched for "Installer" in the start menu and clicked on "Visual Studio Installer". Select "More >" Select "Repair"