Starting with this post ...
How to get a list of all current tags from a mp3 file?
... I did several attempts to help ...
https://community.mp3tag.de/search?q=Tag+Dump+ROW
... now we are there ...
Thanks Dano for putting it all together for easy installation and usage.
*** Export or backup all tag fields ***
Mp3tagCompleteTags.exe
/t/9520/1
DD.20120125.0748.CET