You might try the following, although the PDF seems good enough to me. (The thumbnails you are talking about are not Graphisoft's, but part of Acrobat or whatever reader you are using.)
If you do not have the "Query" command (SQL query) in your Calculate submenu, add it via the Work Environment.
In the query window, enter:
select name, location, preview_jpeg from libraryparts
and click Execute. The result will appear in your browser. There will be a number of entries with no library preview, as even macros will be listed.
You can either edit this HTML result, or convert/import it into Excel or a database.
Attached is the beginning of the browser view that resulted for me with the US library. Were I to have printed the output, it would have been 186 pages (!).
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB