Problem with docman

Hi all, i downloaded the sef_ext for docman components and reda the readme.txt file, then i put sef_ext.php into the ./components/com_docman/ folder. Well now i have some url rewrite problem, the url of my pages are www.xxxxxxxxxx.it/docman/.html when i try to go in the categories, the root of docman is www.xxxxxxxxxxxxx.it/docman.html


Can someone help to fix this pls?

PS. I bought the sef advance component yesterday, thanks

Tried remository and i see that work much better then Docman.