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If OpenWindow(0,0,0,1440,600,"Proofing Tool GUI",#PB_Window_SystemMenu | #PB_Window_MinimizeGadget | #PB_Window_ScreenCentered)=#False : MessageRequester("Error", "Can't open a window.", #PB_MessageRequester_Error) : EndIf
Debug WindowWidth(0)
Tested with PB x64.
Not sure if this happens because my screen size is 1366x768, but it shouldn't matter.
I am planning to use higher sizes for people with Full-HD.