There is a type of Calamus drivers that do not have to be loaded by the user, but will be loaded automatically when Calamus is launched provided they are in the path defined for drivers (the DRIVERS folder by default).
They have the extender CPI = Calamus Preview Import.
The previews are shown in the Preview
field of the Calamus
file selector, but naturally only if the Show preview
checkbox
is active (crossed).
