The CLSID for an ActiveX control is a globally unique
identifier (GUID) for that control. You can prevent an ActiveX
control from running in Internet Explorer by setting the "kill bit"
so that the control is never called by Internet Explorer. The "kill
bit" is a specific value for the Compatibility Flags DWORD
value for the ActiveX control in the registry.
Note that this is different than revoking the "safe for scripting"
option in an ActiveX control. When the "safe for scripting" option
is revoked, Internet Explorer still calls for the control and then
prompts you with a warning message that the ActiveX control may be
unsafe. Depending on the choice you make, the control may be run.
However, after the "kill bit" is set for an ActiveX control, that
control is not called by Internet Explorer at all. To set the "kill
bit" so that an ActiveX control is never called by Internet
- Determine the CLSID for the ActiveX control that you
want to disable. If you are not sure of the CLSID for the
control, contact the manufacturer. If the control is installed, you
may be able to determine its CLSID if you know its friendly
name. To do this, examine the Default string value for the ProgID
key for each of the CLSID keys in
HKEY_CLASSES_ROOT\CLSID. You may need to remove as many
ActiveX controls as possible, except for the one that you want to
disable, in order to make it easier to identify the appropriate
CLSID. For additional information about how to remove
ActiveX controls, click the article number below to view the
article in the Microsoft Knowledge Base:
- Use Registry Editor to view the data value of the Compatibility
Flags DWORD value of the ActiveX object CLSID in the
following registry key:
- Expand HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet
Explorer\ActiveX Compatibility\CLSID of the ActiveX control
(see picture 1).
where CLSID of the ActiveX Control is
the class identifier of the appropriate ActiveX
- Change the value of the Compatibility Flags DWORD value
to 0x400 (in hex) or 1024 (in decimal).
- The modifications you made will be in effect after you restart
the Internet Explorer.