If anyone wants to test/try my little program, then here is a link for it.
Add Book & All Formats To Calibre v1.4.zip
Just bear in mind, I have only tested it with calibre 2.x and not 3.x so have no idea if any issue may exist with installations of the later when using it. But I imagine it would either work correctly or just not at all.
For any budding AutoIt users, the source is in the zip file.