Calibre

Replacing an existing book

• Open the metadata
• drag&drop the new book onto the old book (target the right format)

Link to book on desktop

• Select the book in the library
• Press 'o' (Open book folder)
• with the RIGHT mouse button, drag&drop the format you want to your desktop/folder and select "Create shortcut here"

What to do with related non-book content

For example a .zip with code for the chapters of the book?

• Open the metadata
• drag&drop the non-book in the area where all the formats are shown