Contribute adds filename to URL

[Tek_As]

Hello

Contribute automatically adds filename to URL it is browsing with its own
built-in web browser. For example we enter the url below;

[url]http://www.sabanciuniv.edu/tr/[/url]

and it becomes the url below automatically;

[url]http://www.sabanciuniv.edu/tr/index.php[/url]

we don't want Contribute to do this, how can we disable this?

Thank You
Hakan Tekinaslan