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In Windows Vista, Windows Contacts replaces the Windows Address Book application. Therefore, you need to save the contacts file rather than the *.wab file. To locate your contact file in Windows Vista, make sure you are logged in to an administrative account and that you have Windows Explorer set to show hidden files. Then, use Windows Explorer to go to this location:
C:\Users\<username>\Contacts
where <username> is the account for which you want to save contacts. Save the <username>.contacts file to a safe location. If you have Windows installed on a drive other than C, change the drive letter above to the one on which Windows resides.