  We provide a fast and precise Mellin-space implementation of the
$O(\alpha_s)$ heavy flavor Wilson coefficients for charged current deep
inelastic scattering processes. They are of importance for the extraction of
the strange quark distribution in neutrino-nucleon scattering and the QCD
analyses of the HERA charged current data. Errors in the literature are
corrected. We also discuss a series of more general parton parameterizations in
Mellin space.
