[Dullahir]

Is it possible to do this? Whilst I enjoy the built-in duplicate finder plugin, I'd really like to be able to do this without having to launch Calibre, perhaps a right-click option for folders.

Why? Because if I were to add every book on my laptop, every extension, etc, I'd have to add about 100k books to Calibre. I REALLY REALLY don't want to have to do that.

So is there a tool or option or something of that nature?

To update, the reason why I want to use Calibre's Dupe File Plugin is because *EVERY* Duplicate file finding programme that I've used is inferior. Why?

Step 1. Created a folder
Step 2. Inserted the SAME book with the SAME title with DIFFERENT extensions.
Step 3. Ran the Scan.
Step 4. No results.

Yeah. See? EVERY other duplicate file finder is inferior.