Some lost Tracks with a array of numbers

after my Engine Dj library is broken, i use a lexicon backup to transfer it to engine dj.
Some Tracks were lost.
I found out, these tracks have a array of number instead of .mp3 or .m4a in lexicon
example: “Track.1671834467416” its only this number.
I try to relocate these files but in the file-browser are all of theses tracks are “grey”.
Can u help me ?

Bildschirm­foto 2023-01-12 um 19.01.37

What are the files called in the file browser?

these tracks are mp3 and m4a

What are their filenames?