Running CI without mod_rewrite?

[eluser]simonspoken[/eluser]
I'm trying to get CI running on a server without mod_rewrite installed (and it's not possible to get it installed).

Is this possible? I've created a controller called "test", and have visited:

http://mysite/index.php/test

But that tells me "The URI you submitted has disallowed characters."

Any ideas how I can do this?