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.                                       $WebApp = Get-SPWebApplication $(Read-Host "`nEnter Web Application URL") If ($WebApp.AllowedInlineDownloadedMimeTypes -notcontains ("application/pdf")) { Write-Host