Today, I purchased the whole Object Desktop suite. For the past hour, I have been playing around with WindowBlinds, which I remember having a lot of fun with over ten years ago. However, it just does not seem to work very well, particularly with UWP (Store) apps. The issue appears similar to what this other user is experiencing, except that I am running Windows 10 version 1709 (build 16299.15). Apps like Settings, Edge, and Mail do not skin at all. This would be fine, except that the app windows still get a glitchy-looking frame around them, and the titlebar buttons do not work properly (the click targets seem to correspond with where the buttons would be if the apps were skinned) or at all (in the case of Edge). Adding these apps to the exclusion list (which is not easy, as Microsoft does its best to hide the location of UWP app executables) has no effect, including after a reboot.
This is, of course, highly frustrating. In my opinion, if skinning UWP apps is not supported or not reliable, there should be a way to exclude all of these apps from skinning. I am hoping that I have simply made a mistake somewhere along the way (missed a setting or something like that) and this can be easily resolved.