File Extension JHTML File Format HTML - page JHTML stands for HTML - page. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question application dialog How can you send data from Domino to a URL using a HTML post? How are the graphics and images stored when you save a worksheet as a web page in Excel?