The English used in this article may not be easy for everybody to understand.
ActiveX is a control in the DLL (Dynamic-link library) that can be used as a share data over the applications. ActiveX is a type of library in the file DLL.
Any of the Microsoft Windows data files having the same file format as that of the Dynamic-link library can be called a resource DLL. Examples of such DLLs include icon libraries, sometimes having the extension ICL, and the font files, having the extensions FON and FOT.