Registry Keys for HTML Help ActiveX Control - REGSVRS.EXE /S HCTRL.OCX

REGSVR32.EXE is Microsoft’s Registry Service. tool is commonly run after installing new programs. It's an application supplied by Microsoft to register new programming objects. Usually it's run once for each new module installed by a new setup program.

HHCTRL.OCX and HHTML.OCX are HTML Help ActiveX controls. Without them, features available in HTML help would not be available. This article explains how these files work.

The presence of this startup file (REGSVR32.EXE /S HHTML.OCX) may indicate that this activeX Control hasn’t been properly installed or that you haven't rebooted after installation.

You can determine if HTML Help is installed on a computer by checking for the HTML Help registry key as follows:

1. Click Start, and then click Run.
2. Type regedit in the Open box, and then click OK. This will open the Microsoft Registry Editor.
3. Click Find on the Edit menu, and then search for the following CLSID:
ADB880A6-D8FF-11CF-9377-00AA003B7A11
This is the CLSID of the HTML Help ActiveX Control (Hhctrl.ocx). It is registered by the system during setup. If Hhctrl.ocx is installed on your system, the CLSID will be found under
HKEY_CLASSES_ROOT/CLSID.
If it is not found, Hhctrl.ocx is not installed.

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