Importing contacts saved as .msg into Outlook for MAC 2011outlook MAC 2011.

I used to use a PC running Windows 7 and Office 2010.  When I save my contacts, for some unknown reason they were all converted into .msg files and now i can't import them into my Office for MAC 2011.  I no longer have access to these contacts on my Windows PC.  Is there anyway to do a mass file extension change on the contacts with a .msg file extension that would enable these contacts to be uploaded into Outlook 2011 for MAC?