help: mod_rewrite

My Apache Version is Apache/2.0.63 (Unix) . And i think there is no need to enable mod_rewrite because it is default in this version.
And also in Loaded Modules it says "mod_rewrite" in phpinfo.

Now I want to change my url such as

The original URL:
http://www.mydomain.com/out.php?id=53
The rewritten URL:
http://www.mydomain.com/53.html


So the rule is
RewriteEngine On
RewriteRule ^([^/]*)\.html$ /out.php?id=$1 [L]

Problem is: I am writing this rule into the .htaccess file and uploading it but it doenst work?

What i miss?