Hello, could anyone explain to me how to get Prince of Persia Sands of Time working on a 16:10 aspect ratio, 1900x1200 after the new update? Widescreen patcher does not seem to work at all.

Back in the days I was using a software called uniws. From there you could set the correct resolution.
I also used the DSR in nvidia control pannel (only ticked the 4.0x cause it's only one really worth) With the smoothing factor down to 6%.
As I have the same resolution that you use, it turns the game into 3840x2400 which is really excellent and no remaster can do that. (You can't alt+tab while in DSR though, so you have to go fullscreen)

For the 16/10 you have to go in the game folder, open the file "hardware.ini" with a text editor and change the value "CanStretch" from 1 to 0

Hope this help. If the software is no more available. I can upload it for you. (if it still works)