Fortner Software used to make a free NetCDF to HDF(4) converter for Windows.
It is listed under the netCDF "What's New" page
http://www.unidata.ucar.edu/packages/netcdf/software.html#Netcdf%20to%20HDF%
20converter
However the link to Fortner Software now takes you to Research Systems Inc,
who took over Fortner a few years ago. AFAIK RSI do not distribute this
converter any more (but you could ask them).
I have a copy of the converter. As far as I can see, nothing in the
licensing terms prevent me from sending you a copy...
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Mark Hadfield
m.hadfield@xxxxxxxxxxx http://katipo.niwa.cri.nz/~hadfield
National Institute for Water and Atmospheric Research