Check out some options how abcddb files might be converted to txt format.
There is a program for Mac called AB2CSV from Antonio Lore that can export contacts from a Mac OS X addressbook database (*.abcddb) to a *.vcf file, which is basically a specially formatted text file.
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open abcddb file, Open txt file
ABCDDB
Files with abcddb suffix are almost always contacts databases from Apple Address Book (Contacts) management software macOS / OS X.
TXT
Files with txt extension are simple plain text files viewable in any text editor.
Ascii text parameter description txt file is some kind of audio data that contains human readable information about items at bank, instrument or waveform levels.
A txt file extension is related to the TXT file format used for subtitles. TXT subtitles are used by various programs, like Captions, DVD Junior, TMPlayer, etc.
Files with txt file extension could also be occasionally found as RTTL ringtones for older Nokia Phones creating using the NokRing software.
A txt file extension is associated with MilkShape 3D ASCII data format.
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