Zend Framework : need all URL ends with .html extension using htacess

Zend Framework : need all URL ends with .html extension using htacess

I have tried several methods for URL rerouting in Zend Framework to
convert smart url's.I found some answers in Stackoverflow but they
provides only for particular action and module, But what I need is my each
and evey URL must be ends with .html extension.I tried in htaccess file
aslo , but i'm not success with that. Thanks in advance for helping minds.