There is only one file type that uses the .OLK14CONTACT extension:
Outlook Contact File
File created by Microsoft Outlook for Mac, an email program formerly known as Entourage; contains information for a contact, such as a name, email address, and business information; used for saving contact data entered through the Outlook interface.
Outlook automatically saves OLK14CONTACT files and users do not directly interact with them. They are saved to subdirectories of the following directory:
[user]/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Data Records/Contacts/
Updated: March 17, 2011