ICSTOR games not playing in Full Screen

[Fusidrive]

For some reason all the ICSTOR games won't run in full screen. Only borderless window mode even in maximised. I tried all sorts of troubleshooting steps but nothing had an effect on the game.
I am running the latest version of Windows 10.

 

[TCMS]

RPGM or the latest renpy one?

 

[Bryan_Colt]

Well windows 7 x64 is the way.

 

[Fusidrive]

The older ones, latest one has the option for full screen in settings.

 

[MrBlack ✌]

Pressing F4 switches between fullscreen and windowed mode. At least it works for me.