how to display customized pages in 2.0.7

Hi

I´m using spip 2.0.7, and the simple function to display customized
pages is not working:

http://www.ppgh.ufba.br/spip.php?page=disciplinas

This should access squelettes/disciplinas.html, but shows Error 404...

Showld I change something in .htaccess? What am I doing wrong? I don't
know what else to try...

thank you!!!
tereza