Firefox doesn't know how to open this address, because the protocol (d) isn't associated with any program.

I saw this error message when i was trying to open a PDF document which in web folder, to a new window. This will take place when you are trying to go to a link to a file on your local disk. In my application i gave the http path like this http://localhost:4150/Admin/doc/invoice/12.pdf. Its working now.
here another reference link
http://forums.mozillazine.org/viewtopic.php?f=38&t=617197