  A catalog of common-proper-motion (CPM) companions to stars within 67 pc of
the Sun is constructed based on the SUPERBLINK proper-motion survey. It
contains 1392 CPM pairs with angular separations 30" < \rho < 1800", relative
proper motion between the two components less than 25 mas/yr, magnitudes and
colors of the secondaries consistent with those of dwarfs in the (M_V,V-J)
diagram. In addition, we list 21 candidate white-dwarf CPM companions with
separations under 300", about half of which should be physical. We estimate a
0.31 fraction of pairs with red-dwarf companions to be physical systems (about
425 objects), while the rest (mostly wide pairs) are chance alignments. For
each candidate companion, the probability of a physical association is
evaluated. The distribution of projected separations s of the physical pairs
between 2 kAU and 64 kAU follows f(s) ~ s^{-1.5}, which decreases faster than
\"Opik's law. We find that Solar-mass dwarfs have no less than 4.4% +/- 0.3%
companions with separations larger than 2 kAU, or 3.8% +/- 0.3% per decade of
orbital separation in the 2 to 16 kAU range. The distribution of mass ratio of
those wide companions is approximately uniform in the 0.1<q<1.0 range, although
we observe a dip at q=0.5 which, if confirmed, could be evidence of bimodal
distribution of companion masses. New physical CPM companions to two exoplanet
host stars are discovered.
