I search a free program for XP that makes the following possible: if I use an internet application on my PC to ask for http://www.abcde.com/cat.htm then I get d:\abcde\cat.htm

The solution has to be independent of the internet application that I'm going to use. It should be indistinguishable from the real internet.

This would help me to write my own internet application without actually having to connect to the internet.

I saw that this question has been asked on many forums but I saw no real answer.