High Quality Content by WIKIPEDIA articles! .xnk is a file extension used by Microsoft Outlook for shortcuts to Outlook entities. In Outlook 2003, a user can double-click such a file to open it. With Office 2007, the extension is no longer recognized by default, due to alleged security concerns. Microsoft has posted instructions on re-enabling this extension. A filename extension is a suffix to the name of a computer file applied to indicate the encoding convention (file format) of its contents. In some operating systems it is optional, while in some others it is a requirement. Some operating systems limit the length of the extension while others do not. Some operating systems do not use filename extensions. UNIX accepts the separator dot as a legal character but does not give it a special recognition on the OS level.

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