Note that this files has not been updated since 2005 yet is still very popular to give you good music quality with a much smaller audio file. The MPC format which it creates has been based on the MPEG-1 Layer-2 and on the MP 2 algorithms which makes it very useful. Most codec packs still add this into their combinations as it is still widely used.
The version 18.104.22.168 was last updated in 2005 as stated above. See also the RadLight Filter Manager which gives you even better control over your filters.