I see. If you control the APO, you can update the .inf to include both native and WOW64 versions of your .dll, and register a control interface in both the native and WOW64 COM registries. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Abhinav Singh Sent: Tuesday, December 30, 2014 10:18 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: Create an object of an APO in a win32 APP I am creating a deskband(taskbar toolbar, just a simple button) to provide quick access to the user to turn on/off the APO effect. ________________________________ From: Matthew.van.Eerde@xxxxxxxxxxxxx<mailto:Matthew.van.Eerde@xxxxxxxxxxxxx> To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx> Subject: [wdmaudiodev] Re: Create an object of an APO in a win32 APP Date: Mon, 29 Dec 2014 17:00:04 +0000 Interesting… why are you instantiating an APO from an Explorer plugin? From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Abhinav Singh Sent: Wednesday, December 24, 2014 7:04 AM To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx> Subject: [wdmaudiodev] Re: Create an object of an APO in a win32 APP thanks…I was running trying to create the APO object from a 32 bit app which was causing this problem..I actually encountered this problem when trying to create an APO instance from a dll loaded in explorer.exe but somehow it always failed so I decided to check it on a simple win32 app…a restart fixed the issue with the dll loaded in the explorer as well. Sent from Windows Mail From: Matthew.van.Eerde@xxxxxxxxxxxxx<mailto:Matthew.van.Eerde@xxxxxxxxxxxxx> Sent: Monday, December 22, 2014 1:33 PM To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx> If you’re running a 32-bit app on a 64-bit version of Windows, this is expected; APOs are typically native-only. If you’re running native, check to see that the CLSID in question is registered under HKEY_CLASSES_ROOT\CLSID\{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} and that the hosting .dll exists. From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Abhinav Singh Sent: Monday, December 22, 2014 1:24 PM To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx> Subject: [wdmaudiodev] Create an object of an APO in a win32 APP I am using the code below to create an object of an APO from a normal win32 app. The intention is to check whether the APO is installed in the PC. However i get a Class Not Registered error every time i execute the below piece of code. HRESULT isExistAPO(CLSID CLSID_ClassID, IID IID_InterfaceID) { // CLSID_ClassID is the class GUID of the APO //IID_InterfaceID is the interface ID of the APO //CoInitialize(NULL); CoInitializeEx(NULL, COINIT_APARTMENTTHREADED); HRESULT hr = S_OK; IUnknown *pAPO = NULL; hr = CoCreateInstance(CLSID_ClassID, NULL, CLSCTX_INPROC_SERVER, IID_InterfaceID, (void**)&pAPO); if (SUCCEEDED(hr)) { //APO found pAPO->Release(); } else { //Failed } CoUninitialize(); return hr; }