Software to force steam games in windowed mode?

I am actually trying that now but i am taking Hare in a Hat as an example game and follow the Gorky 17 instructions here http://steamcommunity.com/app/253920/discussions/0/846965705321004825/%3Fl%3Drussian
But not working so far, but there might be games that gonna refuse even with this program?

Also it's a bit tedious having to manually add every game single handed, if there was a way to always have it intercept, that would be better.

Thanks i am downloading it now to try out.

From the games i tried about 50% alt+enter doesn't work or have any other way by menu.
Especially on older games, or a majority of indie games. AAA games has more chances where alt+enter would work.

I like to watch tv shows while playing a game, so that's why i am looking for it.