mimeapps.list

[Default Applications]
inode/directory=file-manager.desktop;
x-scheme-handler/magnet=torrent.desktop;
x-scheme-handler/mailto=mail.desktop;
x-scheme-handler/http=web-browser.desktop;
x-scheme-handler/https=web-browser.desktop;

text/plain=text.desktop;
text/html=text.desktop;
text/x-c=text.desktop;
text/x-java=text.desktop;
text/x-python=text.desktop;
text/x-ruby=text.desktop;
text/x-script.python=text.desktop;
text/x-shellscript=text.desktop;
text/x-tex=text.desktop;
text/x-makefile=text.desktop;
inode/x-empty=text.desktop;
text/csv=spreadsheet.desktop;

application/json=text.desktop;
application/pdf=pdf.desktop;
application/epub=epub.desktop;
application/epub+zip=epub.desktop;
application/rss+xml=rss.desktop;
application/csv=spreadsheet.desktop;

image/*=img.desktop;
image/jpeg=img.desktop;
image/png=img.desktop;
image/webp=img.desktop;
image/svg=web-browser.desktop;
image/svg+xml=web-browser.desktop;
image/gif=gif.desktop;

audio/*=audio.desktop;
audio/mp3=audio.desktop;
audio/ogg=audio.desktop;

video/*=video.desktop;
video/mp4=video.desktop;
video/x-matroska=video.desktop;