I changed the extension of my html page to .php . but in browser when I type services.php page it goes to services/ . And shows 404 not found
From the description of the problem, it appears that 'prettyURLs' are at play.
If you have indeed turned on prettyURLs for your Couch managed site, please make sure to regenerate a new .htaccess file (using the gen_htaccess.php utility mentioned in the docs). This will add an entry in the .htaccess file for the new template.
It is preferred to keep prettyURLs off while the site is still in development stage and templates are being added/removed.
Does this help?