Windows Server 2016 no longer has an option to enable Desktop Experience from Server Manager. Instead, most (but not all) features are enabled by default. One such feature is Windows Photo Viewer, which no longer seems to be available, and there's no clear way of enabling or installing it. Luckily, there's a workaround to get it enabled again.
First of, you need to check on Server 2016 whether the required files are already present. If you have selected to install the full UI, the required files should already be there:
C:\Program Files\Windows Photo Viewer\
C:\Program Files (x86)\Windows Photo Viewer\
They should already be present on a fresh install of Server 2016, but if not, then you ...