What is an ABCDDB file? The file with extension .ABCDDB stands for Apple Address Book Contact List Database. It belongs to Address Book application also commonly known as Contacts. It is a built-in application and included with iOS and macOS operating systems. Contacts application enables users to save and organize information related to their contacts, including individuals, businesses, and organizations. This app allows users to keep track of details such as names, addresses, phone numbers,...
