Users when they try to open PDF file from Internet Explorer 8, they won’t have the button  “Open”. Internet Explorer 8 treats the web applications that need to serve untrusted HTML files, the user is prevented from opening a file download directly; instead, they must first save the file locally. When the locally saved file is later opened, it no longer executes in the security context of your site, helping to prevent script injection.   Internet Explorer 8 has a mechanism to help prevent the untrusted content from compromising your site’s security. When the new X-Download-Options header is present with the value noopen. To overcome, we need to allow the Content Type “application/pdf”, using the Powershell Scripts with the Webapplication.                                      ...

In SharePoint Designer 2010 if you received the error below when trying to open a SharePoint 2010 Site. saying, "Microsoft SharePoint Designer does not support editing non-SharePoint sites" Please do the following to resolve this problem, enable the client integration. To do this, follow these steps: Start SharePoint 2010 Central Administration , and then click Security . Click Specify authentication providers . If the Web application in the Web Application list is not the same application that you want to open in SharePoint Designer 2010, click Web Application on the Change Web Application list. On the Select Web Application page, click the name of the Web application that you want to open. Under Zone , Click Default to open the Edit Authentication page. Under Enable Client Integration , click Yes , and then click Save . For more detail please visit the following link http://support.microsoft.com/kb/981223 Regards Ratsub

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