Registering an ActiveX Control
Any ActiveX control that you use must be properly installed and registered on your machine and any machine that you distribute your application to. See the documentation for the ActiveX control for information on how to redistribute it.
The dialog routine ActiveX control container support is implemented in the files IFDLGnnn.DLL. This DLL must be present and registered on any machine that will run your application.
To register a DLL, use REGSVR32.EXE, located in the Windows system directory. REGSVR32 takes a single argument: the path of the DLL.
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