Some ActiveX controls are automatically registered with the operating system when the ActiveX control (.ocx) files are installed. If the ActiveX control is not automatically registered, then you need to register it before you can use it on a form.
To determine whether an ActiveX control must be registered, open a form in Design view and click ActiveX Control on the Insert menu to open the Insert ActiveX Control dialog box. If the control you want to use is included in the list, you can add it to a form. If it’s not listed, you must register it first.
Û To register an ActiveX control
The ActiveX Controls dialog box appears.