You can use ActiveX Control List application to get a complete list of currently installed and registered ActiveX (and COM of course) components that are available on the system.
As seen in the screenshot below, you can easily Filter out the component that you are looking for. You can also get the DLL path and CLSID of any component by moving your mouse pointer over that component.
Qt users can access this dialog box easily by using QAxSelect class in their code. Note that this only works on Windows and only if you have AXCONTAINER module in Qt.