Meinst Du sowas:
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#include <GUIConstantsEx.au3>
#include <ComboConstants.au3>
GUICreate('Test', 400, 100)
$sUser = _UserAccount()
GUICtrlCreateCombo('', 10, 20, 280, 20, $CBS_DROPDOWNLIST)
GUICtrlSetData(-1, $sUser)
GUISetState()
Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE
Func _UserAccount()
Local $wbemFlagReturnImmediately = 0x10
Local $wbemFlagForwardOnly = 0x20
Local $strComputer = 'localhost'
Local $Output=""
Local $objWMIService = ObjGet('winmgmts:\\' & $strComputer & '\root\CIMV2')
Local $colItems = $objWMIService.ExecQuery('SELECT * FROM Win32_UserAccount', 'WQL', $wbemFlagReturnImmediately + $wbemFlagForwardOnly)
If IsObj($colItems) then
For $objItem In $colItems
If $objItem.Disabled = 0 Then $Output &= $objItem.Caption & '|'
Next
Endif
Return StringTrimRight($Output, 1)
EndFunc