Going to assume your English isn't your first language, because your response didn't really make sense, "yes I know, online is full of examples" implies you already know the answer to the original OP. To save banter here is a working example of what I mentioned above.
Combo.ini
[ComboBox]
ComboBox1 = You chose ComboBox1
ComboBox2 = You chose ComboBox2
ComboBox3 = You chose ComboBox3
#include <Array.au3>
#include <GuiComboBoxEx.au3>
#include <GUIConstantsEx.au3>
Example()
Func Example()
Local $aCombo = IniReadSection(@ScriptDir & "\Combo.ini", "ComboBox")
_ArrayDelete($aCombo, 0) ;~ Delete first column count
GUICreate("Example", 300, 200)
Local $idComboBox = GUICtrlCreateCombo("", 10, 10, 185, 20)
GUICtrlSetData($idComboBox, _ArrayToString($aCombo, "|", -1, -1, "|", 0, 0), $aCombo[0][0])
GUISetState()
While 1
Switch GUIGetMsg()
Case $GUI_EVENT_CLOSE
ExitLoop
Case $idComboBox
$iCombo = _GUICtrlComboBoxEx_GetCurSel($aCombo)
MsgBox(4096, "", $aCombo[$iCombo][1])
EndSwitch
WEnd
GUIDelete()
EndFunc