.OCX File Extension
File TypeActiveX Control
What is an OCX file?
An OCX file is an object file created by various software development programs, such as Microsoft Visual Studio, and are used within ActiveX forms. It contains control behaviors that typically are triggered by user or program events and may be used for functions such as window resizing and scroll bar movement handling. OCX files are commonly written in programming languages, such as Visual Basic or C++.
OCX files were originally called Object Linking and Embedding (OLE) custom controls, but now are referred to as ActiveX controls, which is the component object used in Microsoft's ActiveX technologies.
mscomctl.ocx - Name of an OCX file that contains an update of common controls for Microsoft Visual Basic 6.0.
comctl32.ocx - Name of an OCX file that contains an update of common controls for Microsoft Visual Basic 6.0.