You used to have the majority files using an extension like .php and have changed everything to .htm so using a 301 redirect you can update all links to use the new extension.
All .php files redirect to .htm files, such as xpertphp.com/file.php to xpertphp.com/file.htm
Follow below example of All files with certain extension.
RewriteEngine On RewriteCond %{REQUEST_URI} .php$ RewriteRule ^(.*).php$ /$1.htm [R=301,L]
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