There's just a code to remove the ,html and .php extension! below are all code in that file!
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule (.*) $1.html [L]
RewriteCond...