Originally Posted by itimpi
The actual file assocation itself does not require calibre to be on the PATH as one gives an absolute path to the viewer program. I have the file association setup and working fine. However if I remove calibre from the PATH then it stops working. I was assuming that something that is needed by the viewer program is only found if the path is set up correctly (just as is required for the Calibre command-line programs to operate correctly).
It definitely shouldn't need the calibre install directory to be on the PATH any more.