[펌] Borderless window in standalone player
Of course it's easy. I do it by creating a shortcut or batch file that starts the exe, instead of running the exe file. For example, a batch file. This is just an example, so say our EXE name is RUN.EXE. You would open Notepad, type the following:
start RUN.EXE -popupwindow
Then File> Save as> and in the filename where it says .txt originally, just remove that and use an asterick and a bat extension (*.bat) Hit ENTER, then it will know you want to save as a bat file. Now just type in a name like Launcher.bat, don't forget to remove the asterick but keep the .bat extension. Now you would run this Launcher file. The argument -popupwindow is what allows your Unity Standalone EXE to run without borders :D
[출처] http://answers.unity3d.com/questions/13009/borderless-window-in-standalone-player.html