Additional information
Microsoft describes Internet Explorer update KB912945 in the following article:

"Internet Explorer ActiveX update"
Article ID: 912945
http://support.microsoft.com/kb/912945

Update KB912945 is a non-security update for Windows, and Microsoft has also released a patch that restores previous Internet Explorer behavior until the next cumulative security update in June, 2006. Refer to "Internet Explorer ActiveX compatibility patch for Mshtml.dll" at http://support.microsoft.com/kb/917425

For the most current schedule details, refer to Microsoft Security Advisory 912945:http://www.microsoft.com/technet/security/advisory/912945.mspx

The following options are available to avoid the impact on IBM Lotus products from Microsoft Internet Explorer Update KB912945 or KB912812:

• Remove update KB912945, using the "Add/Remove Programs" option in the Windows Control Panel, remembering to check the "Show updates" box.
• Prevent application of optional update KB912945, if you have control over desktop software installations.
• After application of the April cumulative security update MS06-013 (KB912812), apply the Microsoft Compatibility Patch for Mshtml.dll to Internet Explorer (KB917425).
• Research and modify your own applications that may also be affected by the change to Internet Explorer. Details on how to rewrite your HTML to load the control or applet to be initially active are in the following Microsoft document:
  http://msdn.microsoft.com/library/?url=/workshop/author/dhtml/overview/activating_activex.asp
• Use another supported Web browser to access the affected Web pages, thereby avoiding the changes to ActiveX controls.