IF this is a one-time transfer, Using iSeries Navigator probably works the best. If you are attempting to have this an automated production process, look into the CPYTOIMPF or CPYTOSTMF commands in a CL that is scheduled to run.
Then the IFS location can be set up as a share on the windows client. This also works with with AIX clients.
There are also the Data Transfer From/To iSeries Server options. With these you can define a data transfer, create an icon and launch the transfer on your schedule. You need to include/add the Data Access option of Client Access for the data transfer functions to be available.