#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <GUICtrlCreateTFLabel.au3>
$hGUI = GUICreate('Test', 300, 200)
$nLabel1 = _GUICtrlCreateTFLabel('При<font color="Red">м</font>ер', 20, 20, 200, 20)
GUISetState(@SW_SHOW)
While 1
Switch GUIGetMsg()
Case $GUI_EVENT_CLOSE
Exit
EndSwitch
WEnd