Lost the topic on routing folder to file (filemapping i guess)

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For redir purposes i wanted to prepare me a link like:

http://www.mysite.com/redir

So the user could have a link:
http://www.mysite.com/redir?site=1

The idea is that i substitute /redir for redir.aspx or whatever.aspx but
frankly, i rather would not let the user see this actually pagename (if
possible).

At least the routing is something i want so the url remains stable for a
long time even if i decide to change the topic actually handle this stuff.

Iow, i don't want a situation like:
1) http://www.mysite.com/redir.aspx?site=1
or:
2) http://www.mysite.com/redir/index.aspx?site=1



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