File Extension

OCX File Format

OLE custom control

OCX file format icon

OCX is a file extension for a custom control file format used by ActiveX forms. OCX is used for interface behaviors that are triggered by users or programs; like resizing windows or scroll bar movement.

OCX stands for “OLE control extension.” OCX files were first referred to as Linking and Embedding (OLE) custom controls, but are known now as ActiveX controls.

 

Learn more about OCX files:

Visit the ActiveX webpage.

Ask or answer ActiveX questions or browse the ActiveX FAQ at IT Knowledge Exchange.

Michael Cobb explains preventing ActiveX security risks.

This was last updated in July 2010
Editorial Director Margaret Rouse

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