I made this guide because I couldn't find any other comprehensive guide like this one anywhere online to help me fix Manhunt on steam so I took it upon myself to do it. This was a nightmare trying to get this all set up and I wanted to help other ppl not have to also go through it without help. This method might not work for every single person but I don't see why it shouldn't. These are guided steps for how I got mine to work on a legit and currently updated copy of Windows 10. So if your Windows 10 is outdated or non-legit you might have problems.

DIRECTPLAY
- First I fixed the directplay problem by doing this:
Right click start menu icon, select "programs and features", click upper left "turn windows features on or off", expand "Legacy components", check the box next to "Direct Play". It should then auto install. Also a heads up, I had to disable my Avast antivirus at that time for it to be able to let me install DirectPlay.

GATE FIX
- Next I fixed the problem of not being able to get through the first gate with these files
http://www.moddb.com/games/manhunt/downloads/manhunt-on-windows-vista-and-windows-7-patcher-21
(if that site ever stops hosting the files or that link stops working let me know I can email them to you.)

DXWND
- Then I got a program called dxwnd from here
http://sourceforge.net/projects/dxwnd/
(extract those files to a folder named whatever. mine is named dxwnd.)

DXWND MANHUNT PROFILE
- Now I used a dxwnd manhunt profile that someone already had posted on a youtube video. Put it in your dxwnd folder
https://www.dropbox.com/s/45l69msvvm0gcly/Manhunt.dxw?dl=0
(again let me know if it ever stops being hosted there I can email you it. put that file in your dxwnd folder.)

IMPORTING DXWND MANHUNT PROFILE AND MODIFYING IT
- Run dxwnd and click file then import. Import the file you just put in the dxwnd folder. Now you have a entry in the dxwnd window that you can double click to start the game. Right click on the manhunt entry in the dxwnd window and click "modify". From here you select your game's path and launch directory on the main tab. Here is where I spent about an hour experimenting with dxwnd to try to fix the stutter that it was causing in the game. I fixed my stutter by going to the timing tab and changing the timing from 16 to 1. I also enabled it to run fullscreen instead of a window (done from the main tab) and made sure my mouse cursor was hidden (input tab).

MY DXWND OPTIONS
- Here is also where I cannot remember exactly which options I ticked/unticked all together, so I compiled a shot of all of the windows showing how mine is configured that you can go by. The same options may or may not work for you, but there should be no reason why they wouldn't.
http://imgur.com/l1wMlWb
(if you can't view that pic let me know.)

VSYNC AND TRIPLE BUFFERING
- You will need to force vsync and triple buffering in your nvidia control panel or whatever software ATI cards use.

ADDING TO STEAM FOR IN-GAME INTERFACE
- The only downside is that Steam doesn't see it as running now so obviously there is no in-game Steam interface and no screenshot ability but at least the game is playable. What you can do to enable Steam to show you as playing it and enable the Steam in-game interface is to add a non-steam game and add the dxwnd exe then go to your game list and rename it to Manhunt. Of course it will show you as playing a non-steam game but at least you can then do screenshots.

SOUND LOOP FIXES
- In a couple levels there are annoying sound loops that never stop. One is of a guy pooping and another some p0rn is playing on a loop. Delete the file "crapper.rib" in Manhunt\audio\PC\SCRIPTED\CRAPPER and as for the p0rn sound loop it is in a similar folder delete it also it should be named p0rn.rib or something.

So after a ton of work I finally got my game running acceptably at 1920x1080 at 60fps fullscreen with no stutter and no glitched ai movement.

If anyone has any questions I will try to help you as best I can. If you need any files emailed to you just remind me that they are in my "saved" folder in my email.