@NetAmigo - you can add non ebook type files to calibre (via Shift/A, command line, or Windows Send to). As for ebook file types, calibre will only allow only one of any non-ebook file type per book.
Calibre will not change the non-ebook type files in any way, apart from file names (see below) - e.g. by embedding its metadata, adding its cover, converting etc.
But calibre will handle file operations for non ebook files in the same way as it does for ebook files', e.g. if the authors or title are changed etc. Save to Disk, Copy to Library and Send to Folder also work fine with non ebook file types. As does the new Open With feature.
AFAIK all of the above is 'supported'. Otherwise, Shift/A etc, wouldn't work, and Check Library would report an error if it encountered any non ebook files.
I don't use Send to Device or CC - so I won't speak to those.
BR
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