Files with the abcdp extension can be found as contacts card data from Address Book (Contacts) included in Mac OS X and macOS.
Software that open abcdp file
ABCDP file extension - Address Book card data
What is abcdp file? How to open abcdp files?
The abcdp file extension is associated with Address Book, a digital address book for Mac OS X (macOS). Since Mountain Lion update the program is now called Contacts.
The abcdp file contains individual contact card data.
abcdp files location:
/Library/Application Support/AddressBook/Metadata
The default software associated to open abcdp 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.
List of software applications associated to the .abcdp 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 abcdp file, edit abcdp file, convert abcdp file, view abcdp file, play abcdp 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 abcdp files.
Software that open abcdp file - Address Book card data
Programs supporting the exension abcdp on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Address Book (Contacts) for Mac for open abcdp file action.
