using special chars in filenames.

I am having problems using special chars in filename (I have a 3. part application using this).
If you are using firefox, then firefox fixes the url to the second example itself. But in IE apache says that the file is missing.

the file: http://qcodo.box3.prosjektweb.net/tøst.php
The apache says that is does not exist.

now, try this:http://qcodo.box3.prosjektweb.net/t%F8st.php
Is there any way to make this work with apache? (Like telling apache to fix the url itself?)