Xnk
.xnk is a file extension used by Microsoft Outlook for shortcuts to Outlook entities (e.g., a folder in Public Folders). In Outlook 2003, a user can double-click such a file to open it.
Following the release of Office 2007, the extension was no longer recognized by default, due to alleged security concerns. Microsoft has uploaded instructions on their website in regards to re-enabling the extension.
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