Crystal Reports 2011 / IE 8/7 Print Dialog/Export not working

Using Crystal Reports 2011 and the CrystalReportsViewer control in ASP .NET

When using HTTPS in IE 8 and 7, the report shows correctly, but the pring dialog doesn't get displayed, and the export function fails. Its ok in IE 9.

This is caused by a problem in IE8 and 7 when a PDF is sent to the client because of the Cache-control header. There is a M/S KB article on the subject (http://support.microsoft.com/kb/323308) and suggests a registry change, but my customer doesn't want to do that. The registry change does fix the problem.

Where is the response header for this created? I can't seem to find any reference in the SDK.

Thanks

Wes Kinzett