An abcdg file extension is associated with the Address Book for macOS (OS X). An abcdg file contains data.
Software that open abcdg file
ABCDG file extension - Apple Address Book data
What is abcdg file? How to open abcdg files?
The abcdg file extension is reported to be used by Apple Address Book (also known as Contacts) a contact management app for Apple macOS (OS X) operating system.
The abcdg file stores some kind of data used by Apple Address Book.
The default software associated to open abcdg file:
Address Book (Contacts) for Mac 
Company or developer:
Apple, Inc.
The Address Book (Contacts) is a little handy application with loads of features that are often overlooked by most users. Its very useful for for organizing your contacts, but Address Book's real power is that it works with many other applications. Its an integral part of Mac OS X (macOS) operation system. From Mac OS X Mountain Lion the Address Book will be renamed to Contacts.
Company or developer:
Apple, Inc.
macOS is Unix-based desktop operating system, a successor of Mac OS X system for MacBook-family, iMac, Mac Mini and Mac Pro computers, developed and sold by Apple, Inc.
Company or developer:
Apple, Inc.
OS X or Mac OS X is Unix-based operating system developed by Apple Inc. for Macintosh computers. It contains basic core applications for everyday use, such as Finder basic file manager, Safari for Internet browsing, QuickTime for video, iTunes for managing audio data and iPod, iOS devices management , iMessage instant messaging, Mail, Contacts, Calendar and many more.
The latest version 10.11 of OS X is called El Capitan. It is available to purchase on Mac App Store as well as is distributed with new Mac computers and notebooks. It includes features to improve the security, performance, design and usability.
OS X operating system was replaced by new macOS in 2016!
List of software applications associated to the .abcdg file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open abcdg file, edit abcdg file, convert abcdg file, view abcdg file, play abcdg file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting abcdg files.
Programs that can create abcdg file - Apple Address Book data
Programs supporting the exension abcdg on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Address Book (Contacts) for Mac for create abcdg file action.
