Restore the "Always warn before previewing" dialog
When you attempt to "live" preview an attachment in Outlook 2007's
reading pane and uncheck the box to "Always warn before previewing
this type of file ",
if you want to restore this setting, you'll need to edit the
registry.
Subkeys for each file type is stored in
HKEY_CURRENT_USER\Software\Microsoft\Office\Previewers
Delete the key for the file types you don't want to automatically
preview and press F5 to refresh the registry key before returning to
Outlook.
More Information
You can disable live preview for any or all attachment types in the
Trust Center. Go to Tools, Trust Center, Attachment Handling
section.
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Updated
Jul 15 2008
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