ic2850rw.zip: IC version 2.850 with libs for the rug warrior
ic2850r2.zip: IC version 2.850 for the LEGO Robot Contest rev 2.21 
                 board from MIT

To unzip one of these files:

1) Copy the zip to the top level of your hard drive
2) Type
pkunzip -d ic2850rw.zip (or ic2850r2.zip)
  The -d is important to pkunzip to preserve the directory structure.