There are 3 different apps in play - Picture and Fax Viewer, Windows Photo Viewer and Photos (As far as I am aware Photos is the latest one for windows 10). The first 2 seem to be usable with windows 10 (though to get photo viewer back you need to use an app called windows tweaker 4.0 from the windows club).
I don't think there will be an easy way to get picture and fax viewer for windows 10, at least without also having to edit the registry. But there are always other options available online. Google some of the best photo viewers and you will likely find one that suits you rneeds.