Hi misty,
yes Get WAIK Tools is redistributable, feel free to use it as you like.
The range command of GWT is actually only thought for ISO (or other uncompressed) files.
Extracting files from inside a cabinet, without loading the complete file, is much more difficult.
From the topics, I take it you are looking for the 2 big cab file that hold all the winpe component packages?
If so, I don't think it's possible to reduce the download much.
They are packed with MSZip compression, with many files in separate blocks.