>>106543213 (OP)
I use Microsoft Photos on Windows 11, works fine, since I only care for the basic functionality of using it as a gallery and opening images, and it supports pretty much all the formats and just werks. I did try some foss alternatives, but none made me happy, ImageGlass feels bloated and it also had that very unfortunate stinky incident with them shipping spyware once, most of the big ones like XnView or IrfanView are proprietary and ugly as sin despite being super powerful and performant, Nomacs just feels like it doesn't belong on windows, it's like a bloated KDE program or something, and I don't like the way it always updates on first boot, I think JPEGView is really annoying with how it expects all configuration changes to be done through a manual ini file, the best third party one I found is qView, it's really simple and just werksy, so if I'm ever using LTSC again I'll probably just qView it up.