It is not recommended to install the 'stand-alone' POL Viewer if you also have it installed via Steam. Bad things can, and will happen when doing that.
I don't doubt however, that there is a way to make them work together, but for the average user, I can see it spawning more harm than good, unless it's merely the installation order that affects the outcome. In any case, I wouldn't recommend that method except for the adventurous...
The location where Steam installs it, is not a bother. ^^;
