Change the styles of a window

I have been trying to change the style of a window such as notepad or ventrilo but, all I have managed to do is break the window removing title bar and borders and making clicks land on the program below it.


Functions I tried:

WinSetState($Title, "",$style)

_WinAPI_SetWindowLong($hWnd, $GWL_STYLE, $style)

Local $scall = DllCall("user32.dll", "long", "SetWindowLong", "hwnd", $hWnd, "int", -16, "long", $style)


Also Auto it style values look like: 0x80000000
While the equivalent MSDN styles look like: 0x80000000L

When I try to add the L scite complains  Missing separator character after keyword.