Windows Address Book uses WAB file format for storing the information of the contacts saved by the user. The Address Book is an application of Microsoft Windows that is used to save a list of contacts in one single file which is known as Address Book.

This file is given the extension of WAB. This file allows the system or user to share the contents of the file (contact information) among a number of applications which are based on Microsoft operating system. This WAB file format can also be used by a number of applications for conversion or exporting the contents of the file into other formats.