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... a better solution would be to force the game to create the message box as if it was running in 1024x768. Not sure if there is a graphics file that can be modified for this or if it would be an additional .exe hack required.
Yes, that is what was done for Doomsday. the message box was correctly shrinked. Effectively the left interface panel cannot be shrinked too much in order to have it readable at most...
 
have a 16:9 monitor, added a loadscreen of the proper resolution

1920x1080 doesn't work
1280x720 also doesn't work

crashes when loading a scenario.

Its an instantanous crash.
 
have a 16:9 monitor, added a loadscreen of the proper resolution

1920x1080 doesn't work
1280x720 also doesn't work

crashes when loading a scenario.

Its an instantanous crash.
1280x720 will not work under any circumstances. Only resolutions HIGHER than 1024x768 can be made to work with the .exe hack.

What did you use to resize the load screen? In my experience MS Paint did not do it correctly.