Download this app from Microsoft Store for Windows 10 Mobile, Windows Phone 8.1, Windows Phone 8. Sure, both photo managers are great, but we choose XnView MP over the Classic version for its OS support: there are versions for Windows, Mac, and Linux. People who say you cannot do it are wrong. Select About Photo Gallery (It should show you the version and the build).
Considering you’re kind of stuck, with ‘photos’ in both IOS and MacOS (at least MacOS has REAL phot/Video tool alternatives) I don’t see any point in having a dedicated gallery app. Getting iPhoto for PC is not at all a hassle, provided you have a Mac OS. I've upgraded from a Windows 7 Home Premium Toshiba laptop to a Lenovo PC with Windows 10. Some of the programs listed below are not only image viewers, but also pictures managers.
