dahbk: You shouldn't have to go trough all that trouble. I just play windows version as it is on my win 10-64bit.
All you should have downloaded was dxwnd.
1) Install HOMM2 GOLD
2) download dxwnd
3) Run dxwnd
4)go to game directory and drag&drop heroes2w.exe on dxwnd. A menu will pop up. Be sure to uncheck Run in Window. Nothing else, although you're free to conduct experiments at your own risk :) ... Press OK.
5) you'll be returned to the small dxwnd window. Double click on heroes icon and enjoy.

Few notes.
You actually don't need to set any compatibility modes to play the game this way. You can try thou, if there is any trouble with sound or anything else.. I don't recall anything particular.

There is three heroes2w.exe files in existence (to my knowledge)
Sucession Wars
Price of Loyalty 2.0
Price of Loyalty 2.1

POL 2.0 runs smoother, but there is a problem with cd opera music. Terrain themes in particular. They keep restarting after you go to in to castle screens, switch to hero who is on different terrain, end your turn and wait for next day.You will probably never hear grassland if you wont wait for it on purpose :)

POL 2.1 Is a bit laggy. for example, pick up some ore or treasure chest and you will notice a small pause in your game play. It is very very small but it's enough to drive you crazy :D It works fine regarding music tho.

SW nothing much to say. It has different town themes and you can do some funky stuff with function keys (F1;F2...) in battle screen. Try it ;)

In the beginning you should have to install SW, then expansion POL and then apply patch to get 2.1 exe file.
HOMM2 GOLD right away is POL 2.1 version. You're pretty much stuck with it from the beginning.

GOLD installer works in 64 bit windows.
Original SW and POL expansion installer wont work in 64-bit windows. Use 32-bit version, if you have to.

Also, make sure to put your iso image in the very first virtual cd drive when palying, otherwise cd opera wont work.

Anyone trying to play the game with a dos-box... i feel sorry for you. This might be helpful thou .

dahbk: wasn't that for gog verion (dosbox emulatoion)?

Edit:
Newer mind. I just used your download link for heroes10fixes.
I remeber trying to use something similar from here. Didn't work at that time. Strange.
This time game launches, but it look very pixelated and also cd opera is not working. Also, game is laggy. Do I need gl wrapper?

dahbk: The only strange thing is that game looks very sharp. It's like too sharp :)

dahbk: What kind of sorcery is this? It works like a charm! :)
The only strange thing is that game looks very sharp. It's like too sharp :)

U R DA BEST. Thankyou!
Paldies!

Edit:
Sharpnes can be fixed with F3

ZFR: They tightened up the graphics on level 3.

AKuHAK: All these fixes are not mine, but thanks anyway :)

AKuHAK: Hello,
If you are using GOG Windows version you can play *.ogg tracks instead of MIDI after little game modifying.
1) You just should update winmm.dll from game folder to this one https://www.filedropper.com/heroes2win10fixes
Just extract ogg-winmm.dll rename it to winmm.dll and put it in the game folder (replace existing)
2) You should put wing32.dll from this theme in the game folder as well.
Direct link for download: goo.gl/Fz6QdT

Please keep in mind that first dll doesnt work without second so you should use it alltogether.

After that you will be able to play Track*.ogg tracks from folder MUSIC in game installation folder when you select CD quality in game. They are not the best quality btw: 192 kbps VBR, so you can rerip them from your disk if you wish better quality in OGG VORBIS format.

As about different music sets - NWC changed all castle themes when price of loyality was released. There is also 3rd set of music in Millenium edition. You can find more info here