Preferably verify that these do work on Win 10 (per definition now the 'standard' OS.
Ps2: if you know of other similar tools, feel free to post them here. # made/posted a small hack (based on that article) but his hack_tool did not work for me either.
Ps: I recall #Sunbeam posting an article on the subject for AC 4 specifically but couldn't find the post anymore. (lorer) also seems do this job well (be it far less limited in options). In the mean time, a quick google brought me here: 'How to run Assassin's Creed IV: Black Flag in Windowed Mode youtube'. Recently, I had to move to Win10 (unfortunately), and currently no longer gets the job done for AC Black Flag (and probably other games as well). I have been using - pretty successfully - so far, to get the job done.