UPDATE: With the addition of the ObjCreateInterface function and enhanced COM functionality by trancexxx, these interfaces are now accessible directly in AutoIt. I've rewritten the plugin as a native UDF which will work when compiled as x64 as well. I've attached the new UDF as well as updated plugin and UDF versions of my OSD Volume script. UDF Example: #include <_AudioEndpointVolume.au3> ; ## Get current volume levels $vol = _GetMasterVolumeLevel() ConsoleWrite("Get Vol Error: "