I just wanted to add that borderless window option to the ntf launcher not put it into 1.3.9
Well, you still need to know how to code in Blitz3D to do that and it's not that easy to do as the new borderless windowed mode uses screen scaling which I personally haven't programmed into the game and I'm not sure if it's actually compatible with the ntf mod (due to the mod still using FastExtension and the newest SCP:CB versions don't use it).
I know the borderless windowed mode works using a main scaling sprite that scales the whole screen to make it fit the resolution of the desktop. But again, I wasn't the one who added that scaling thing for the borderless windowed mode and I actually never looked into it how exactly it works.
Another side note: The borderless windowed mode is actually nothing different than the windowed mode in that game, except it doesn't has the window borders and it it played full-screen, so if the bugs you see while playing the game in windowed mode happen then they won't most likely get fixed in borderless windowed mode for that version and I think this might be due to FastExtension (as it's not really compatible with Windows 8 and higher and even for other WIndows versions, as it's really unstable). To fix that problem entirely you would need to get rid off FastExtension entirely but I don't know what effort that will take as well.