When I run WL, I get a quick flash of a rectangular box, then it ends.
The stdout.txt includes:
There's no configuration file, using default values.
Widelands executable directory: C:\Games\Widelands
Adding directory: C:\Games\Widelands\data
selected language: (system language)
Could not read locale fontset for: ga
I do not know why it is looking for ga (Galacia?); I am in the uK and all is English (UK).
Opengl is at 4.3