.OLK14SIGNATURE File Extension

HTML signature saved by Microsoft Outlook for Mac, an email program that replaced Microsoft Entourage; contains an email signature that is formatted using HTML code; saved and loaded automatically through the Outlook interface and is not directly accessed by the user.

Microsoft Outlook for Mac saves OLK14SIGNATURE files to subdirectories of the following directory:
[user]/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Data Records/Signatures/