hey all I managed to get Rogue Spear on Win 8 with AMD card to run in fullscreen "borderless windowed" (Does not work in the menu)

Just download this, [You must login to view link]

After installing Borderless Gaming 7.9, make a shortcut if it has not done so and run it
Launch Rogue Spear
Alt Tab to the program and Rogue spear will appear in the list of Applications on the left. Add it to fav and click the button in the mdidle to make it full screen

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Go back to the game and when you launch your missions the game will go fullscreen even though it's disabled in the reg.

:)