Some operating systems require file extensions to be limited to three characters. As a result, HTML files are represented with a ".htm" or ".HTM" extension.
On our servers and most Unix systems, the convention is to have HTML files end with ".html".
This tool renames ALL ".htm" or ".HTM" files in your web site to have a ".html" extension. For example, if you have a file called help.htm, it will be renamed to help.html