  We investigate the properties of microlensing events caused by planetary
systems where planets with a moon are widely separated from their host stars.
From this investigation, we find that the moon feature generally appears as an
very short-duration perturbation on the smooth asymmetric light curve of the
lensing event induced by the wide separation planet; thus it can be easily
discriminated from the planet feature responsible for the overall asymmetric
light curve. For typical Galactic lensing events with the Einstein radius of
$\sim 2$ AU, the asymmetry of the light curves due to bound planets can be
noticed up to $\sim 20$AU. We also find that the perturbations of the wide
planetary systems become dominated by the moon as the projected star-planet
separation increases, and eventually the light curves of events produced by the
systems appear as the single lensing light curve of the planet itself with a
very short-duration perturbation induced by the moon, which is a representative
light curve of the event induced by a star and a planet, except on the Einstein
timescale of the planet. We also study the effect of a finite source star on
the moon feature in the wide planetary lensing events. From this study, we find
that when the lunar caustic is sufficiently separated from the planetary
caustic, the lower limit on the ratio of the lunar caustic size to the source
radius causing a $\geq 5\%$ lunar deviation depends mostly on the projected
planet-moon separation regardless of the moon/star mass ratio, and it decreases
as the planet-moon separation becomes smaller or larger than the planetary
Einstein radius.
