leeneia - you can resort the file list in explorer or in my documents by "type" - then all your nwc files will be together. you can click on the first one, shift click on the last one and copy them all at once.

in dos - issue the following commands

cd\mydocu~1

[the prompt should change to mydocu~1 OR My documents - depending on the exact way your OS is setup]

copy *.nwc a:

[this command will then copy all your files as you are currently in the correct sub-directory.