Getting .htaccess to parse your php to php5

[SeargentPepper7]

I need to get .htaccess to, by default, parse all the php files to php5 files. I found out I needed to do this on some other php forum boards so I'm not completely sure what this means. If this doesn't make since here is what I want to accomplish:

Instead of typing http://www.something.com/index.php I want it to be a php5 file so I will be typing http://www.something.com/index.php5. Please don't ask why I want this because it is very long and confusing...