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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.