This indicates a problem with Firefox and/or your system configuration. You may wish to try locating and opening the above-mentioned file using Windows Explorer (by double-clicking it), reinstalling Firefox, or setting a different browser as your default.
Tried locating the file. It does not exist.
Changing the default browser to IE did not do it either.
I presume KVS creates the file on the fly?
Fyi, I'm using Vista