Apparently they don't even see the starter window.
the game would launch and on the task bar there would only be a blank box that would eventually show the face icon"32 ICO File" but the screenshot [of the starter window] you shared never would show
That person then tried the game with -diag set, and surprisingly it worked.
He had another issue though, that the game would get super slow (2-3 FPS) after playing for a short bit. Took ages to debug that. After showing me a video I noticed he had no sound.
Hey so the problem was, for some stupid reason, my speakers were plugged into my motherboards back audio panel and its messed up somehow.
I didn't think that could cause a problem but my friend kept telling me that i should switch back to the front port cause the Nahimic 2+ audio drivers I'm using only work with the front panel;
so he changed it front the back to the front audio port and i started the game and it works properly now with audio.
I have not yet heard back from that guy if the game works without -diag as well now (EDIT: It doesn't, he has to use -diag). I'm using "-ns" in the starter window definition btw. (I only initialize my DirectSound8 implementation 3 frames after launch.)
No one of the other people with the same issue (game does not launch, "running in the background", not responding) have responded so far with more information.