How can I export the Extended Tags (Alt+T) info ?

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@Florian + DetlevD:

Thanks a ton for your support. The linebreak works. I'm really happy, because I've been looking around for quite some time now and until I discovered MP3TAG I didn't find any program with such a flexible export function.

I'm all new to the program, and I'm trying to find the info on my own as well, but there 3 points, where I'm stuck:

(1) That's actually the only really important one: $list exports - at least I hope it does - all the tag fields, no matter if it's a common tag field name or if it's a custom tag field with an entirely random name. So far so good. But I would need to export all fields of ALL TAGS, but $list apparently exports only one tag (with APEv2 and id3v2 taking precedence over id3v1 for example). I would need to do this in one run and - preferably - export everything to the same file. Is there a way to export all tags ? (2) Ok, the second point really is not important, if you don't happen to know it anyway, just don't bother with it. I was just curious if there were a "padding function" for letters (much like $num(x,y) for digits) ?

I would like to arrange the $list output ....

... like this: GENRE == Fusion

             ENCODEDBY == Exact Audio Copy (Mode Sécurisé)
       ALBUMARTISTSORT == Bullyrag
MusicBrainz Album Type == album
(3) And talking about $functions .... Where can I find information about the scripting functions available in MP3TAG? I only found https://docs.mp3tag.de/export but $num and other functions I've seen in the forum are not mentioned there ... (4) Ok, so actually, it's 4 points .... :stuck_out_tongue: ...

I'm still a bit confused about this U+000D stuff .... I mean, you took lyrics as an example, it's normal that there are linebreaks inside the field, because it's a multiline field, but as for the other fields .... ? And when you say "After importing the contents into a tagfield", do you mean importing via Convert/Text File->Tag (alt+F4) ? And so does your code ... $replace(%tagfield%,U+000DU+000A,$char(13)$char(10)) ... go into the alt+F4-import-dialog-window or should it rather be part of the .mte file you posted here ? And I couldn't find %tagfield% in the linke I posted in (3) .... ? And what is an "action Tagfield Format" ...? I'm sorry if all of these might be stupid questions, I'm just not yet quite familiar with all of that ...
And thanks again, the info you gave me already has helped me a great deal so far !