Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long

Public Function retWinDir() as string
     Dim a As String * 256
     GetWindowsDirectory a, 256
     retWinDir = Left(a, InStr(a, Chr(0)) - 1)
End Sub