Win 7 here, dunno if this helps you (Have no idea about Win10) :

I used Alt+Enter to get it into fullscreen, though my Character skips a few frames when walking then.

Then i used the Maximum Resolution the Game had to offer, and made myself a "fullscreen mode" by dragging the window to the top of the screen

Game plays fine now :)

Did GOG add 16:9 support, or is it just still 16:10 support?

I am able to choose between
Five 4:3 Resolutions
1280x720 and 1920x1080

So yes 16:9 is in it, but like i said i kinda have problems with full screen thats why i use full window instead

Edit: It was the framerate problem the Guy in the other Thread mentioned, Turning VSync off helped :)

The other way around apparently. It would let me choose 1920x1080, but my native resolution is 1920x1200.

OK, thanks

I had the retail discs, check out website wsgf, I just remembered, I did an .ini edit to run 1680x1050 on my 1920x1080 monitor, now I don't remember what the resolutions were offered, I do remember 4:3

Heres a little guide to get it to run (mostly in full screen) I got most of it from http://pcgamingwiki.com and the rest are notes I have come up with my own:
Install game

Run it once exit

Go to ...\Men of Valor\VIETNAM\SYSTEM\ and Delete the File PROFILE_Shepard

Go to --> ...\Men of Valor\VIETNAM\SYSTEM\defuser.ini and
\Men of Valor\VIETNAM\SYSTEM\user.ini and put your des. resolution in:

[Engine.Input]
*
F4=
F5=setres 1920x1080x32
F6=
*

FOV edit: Go to --> ...\Men of Valor\VIETNAM\SYSTEM\user.ini look for

DesiredFOV=85.000000
DefaultFOV=85.000000
VertSplitFOV=85.000000

and change it to 95 (for 16:10) or 101 (for 16:9)

Now in Game press F5 to get HOR+

Note - The FMVs are always revert back to 4:3

Then run the game set up own profile and settings, delete any automatically made one's
*Shepard*

Open MenofValor.ini and make sure that the resolution settings are all correct,
mainly FullscreenViewport & MenuViewport
You can also take a look through this file as it contains many graphics options not in
in the in game menu.

Run it see if it works, if it does play

This works on my Windows 10 machine you could give it a try.
(apologies for any spelling error’s I write these things down as private notes so I don’t have to look it up or even think when I reinstall games)