I know we can add DO picture viewer as systemwide default viewer when using "open with" or some reg-entries. But why you don't simply add it to "default progams", where we simply can check the desired filetypes like in other viewers (e.g. JPEGView)?
Of course adding a view types is not that much work, but first I need to have all kind of pics to register (I want to to have a fully configured sys) and it's just a comfort-thing e.g. on a fresh install (like after a Creators Update release).