Outlook Express opens PDF attachments with wrong version of Adobe Acrobat #

While double clicking PDFs from within Windows Explorer opened them in Adobe Acrobat Reader 9 (the default PDF handler), double clicking PDF attachments from within Outlook Express opened them in Adobe Acrobat 6. This issue was resolved by changing the values of

  HKEY_CLASSES_ROOT\AcroExch.Document.7\shell\Open\command
and
  HKEY_CLASSES_ROOT\AcroExch.Document\shell\Open\command

to the path of the current version of Adobe Acrobat Reader:

  "C:\Program Files\Adobe\Reader 9.0 Reader\AcroRd32.exe" "%1"

(Thanks to wimvh for digging up this fix)

/windows | Feb 06, 2010

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