What operating system are you using on the machine running calibre?
If it is windows then make a shortcut to calibre's ebook reader for each book. The shortcut would contain something like
Code:
"C:\Program Files\Calibre2\ebook-viewer.exe" "C:\Users\charles\Desktop\debug\Verne, Jules\20,000 Leagues Under the Sea.mobi"
The first bit is the path to the viewer. The second is the path to the book.