This is wierd, normally you should have a warband folder in your documents folder. Hopefully this fixes it.
Try this:
1. Uninstall game in Steam
2. After you have done that, delete the Mount and Blade Warband folder in Steamapps - Common.
You might have to re-download every mod that you are playing though.
No worries, I have no mods. I did all that multiple time even used this command "steam://flushconfig". There is no solution in the internet i haven't checked or tried. I am actually thinking of deleting steam right now.
restart pc
Even this supreme trick is not working.
Maybe it's that since the rgl_config is basically the launcher settings and the ingame settings.
Is there a way to download this file and everything i might need for the document folder?