Export and import of the cover image

I would like to export the cover image to a .csv file
Then in a text file to tag converter import this image into another file

I do not think that you can put picture data into a plain text file (which csv is).
You would have to save the pictures into the file system with an action.
If you choose a really unique name like
%artist%_%album%_%title%_%_cover_type%
and the target files have the same data for ARTIST, ALBUM and TITLE, then it should be easy to get the right picture into the right file - again with an action

Well, you can store binary data within a text file as a data: URL, for instance, but maybe, what is really wanted, is the cover image file name.

I do not know any other MP3tag function that deals with pictures than the 2 actions for export and import from the filesystem.
I do not know any function for export scripts that puts binary data into the export file.
The embedded pictures do not have a filename, this filename has to be defined by the user - which is more or less the way I described it.
As I do not know which workflow the OP wants to follow, I cannot help with more details.

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Je vous remercie pour toutes vos réponses