[BetterRed]

Originally Posted by Nicolas F

This is not the folder BetterRed was talking about.
To open the configuration folder, in calibre, go to preferences -> miscellanous -> Open calibre configuration directory
(this folder is somewhere in your user folder, but it's a hidden folder)

If you put your file in the resources\images\mimetypes folder there it should work!

Thanks mate

@jcrawfordx - apologies, I should have included this link ==>> Overriding icons, templates, et cetera

BR