Page URL without the .html

I have an insistent client that claims she could once view the following page without the ".html" at the end.  Did something change in Homestead that would make the following url not work without adding the ".html" at the end?
http://www.gcsct.org/imagine.html

She claims http://www.gcsct.org/imagine
worked before and now it does not. She printed all her marketing materials like that and is insistent something changed.  Can this url be pointed to http://www.gcsct.org/imagine.html?
Any help, is appreciated!