Originally Posted by Lynx-lynx
... Do you create this using Preferences, Add your own Columns?
Yep - (see attachment 1)
You can include custom long text columns in the book list, and you can edit also them from there, and of course you can display in Book Details and edit them in Edit Metadata
The Long Text editor has a tool to insert Hyperlinks (see attachment 2)
Getting a folder or file path as a URL in Windows can be a little bit tricky. They must start with "file:\\\", have space as %20, comma as %2C etc. I use the "Copy Internet Path" function of FileMenu Tools (a swiss army knife shell extension) to do it for me.
ps : This may have some relevance - be aware its an 'old thread' that just got resurrected - audio books in calibre