What is a .ABCDP file?
The .ABCDP file extension stands for Address Book CoreData Person File. It's a type of backup file used by a program that helps organize contacts on computers that run OS X, which is an operating system made by Apple. This file contains important information about people in your address book, like their names, phone numbers, and email addresses, but it's saved in a special way that the computer can understand easily.
You can open this type of file with the Apple Contacts program, which comes included with OS X. This means you don't have to download anything extra to view or use these files if you're using a Mac computer.
Here's how it works: When you open the Apple Contacts program (or Address Book in older versions of OS X), the .ABCDP files help put together or fix up a database. This database makes it faster to search for contacts. Plus, these files help you find email addresses when you're using Mail or iChat, two other programs that come with OS X and work together with Contacts to make things more convenient.
You'll usually find .ABCDP files stored in a specific place on your computer, which is: /Library/Application Support/AddressBook/Metadata.
It's good to know that this file format started being used with OS X 10.6. Later, when OS X was updated to version 10.8, the Address Book program was renamed to Contacts, but it still uses .ABCDP files the same way.
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