Irfanview has been my image viewer on Windows for years now. You can install the full plugin pack from the main website (button below the main installer download) and you'll be set for just about anything that identifies as an image.

(edit) It's not FOSS though, but it is free.

I'd probably say nomacs.

I've heard good things about xnview

It has nice ui, support, is cross-platform and foss

Edit: it is freeware, not foss!

Oh man lol... I think you're looking for Linux...

Just accept that it's this is the kind of thing that bothers you, you need to embrace Linux lol.

Aside from that, your browser can open just about any image format.

I'll have to look into some of these responses. Up till now I've just used gimp because it's already installed. I always think I should find something faster just for viewing but I never do

I like qimgv

@PiraHxCx Consider the following #gpl3 options:nomacs - nomacs.orgImage Glass - imageglass.org

@PiraHxCx Unless something new has come along to beat it, #ImageMagick is prolly the best tool there is. It ain't perty, but it does perty much everything you might ever need.https://imagemagick.org

maybe ?

Firefox (or some derivative). But I guess the real solution is to make that Linux switch.