Add the following registry key if you want to avoid a “save as” pop-up message if you open PDF files within Internet explorer 9. With Internet explorer 8 it was opening automatically so I exported this key from a machine with IE8 and this key seems to work perfect with Internet explorer 9. I had this issue on a lot of workstations with Adobe Reader XI + Internet explorer 9. Even if the “Adobe PDF Link Helper” plug-in was installed. This plug-in is installed automatically with Adobe Reader XI but seems not to open PDF files automatically. This issue does not occur with Adobe Reader X.
[HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\AttachmentExecute\{0002DF01-0000-0000-C000-000000000046}]
“AcroPDF.PDF.1″=dword:00000000
Hope this can help someone.
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