Instead of choosing our own default PDF viewer, we should probably
invoke the user's default PDF viewer. Every OS has a command-line
program to open a file with the system default program:

On OS X:
open myfile.pdf

On Windows:
start myfile.pdf

On Linux, there separate programmes for KDE, new gnome and old gnome,
and desktop-agnostic:
kde-open myfile.pdf || gvfs-open myfile.pdf || gnome-open myfile.pdf
|| xdg-open myfile.pdf

Cheers,
Sietse

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