I just want to run risk of rain in a window with no border. I already have it in windowed mode, I just need to remove the border. Please help as this is very annoying to me! I can't run in full screen because I'm running a multi-monitor setup and when I click anything on the second display the display with the game on full screen goes to the desktop.
Have you tried using the application Borderless Gaming?
This forces games to run in a borderless window state. I've not tested with Risk of Rain, but have had success with other games with no borderless window mode as native!