.ABCDMR file extension is created by Apple, Inc.. .ABCDMR has been classified as Database Files.
The abcdmr file extension is associated with the Apple Address Book (now called Contacts) application.
The abcdmr file contains database of e-mail addresses, that were recently used in the Apple Mail.
ABCDMR is using SQLite database format and can be opened for example in the sqlite3 command line application, that is a part of the Mac OS X (macOS).
How to open:
This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.
How to convert:
As far as we know, this .abcdmr file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.