File Extension JHTML File Format ATG Dynamo server page ( Java HTML ) JHTML stands for ATG Dynamo server page ( Java HTML ). 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 Difference between ATG Dynamo and ATG commerce Best IDE for building JSP pages What is the location of servlets?