Curious as to what everyone is using for general and work images. I haven't liked the windows image viewer since 7 for my own photos. I have found that it does a poor job of compressed viewing in fit to screen or fit to window. My photos always look distorted. Then when I zoom to 1:1 they look as sharp as they should. About a year ago I switched to Fastone Image Viewer and couldn't be happier. It does a great job at all zoom levels and has a lot of good tools for cropping and editing all basic file types including raw, which I work with a lot.
So what's in your toolbox?