Its not low level then is in wine.
Wine probably dont recognize ws_popup style.
ws_popup is style without caption and without sysmenu.
You can try this example:
indexbase 0
include "wFunc.inc"
% WS_CAPTION = 0xC00000
% WS_SYSMENU = 0x80000
INT wstyle
INT w1
wstyle = ws_popup or WS_CAPTION or WS_SYSMENU
w1=OpenWindow "Uffo2",300,300,wstyle
'
do while bRet := GetMessage (&wm, 0, 0, 0)
if bRet = -1 then
'show an error message
else
TranslateMessage &wm
DispatchMessage &wm
end if
wend
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