File Extension PH File Format Optimized .goh file (Geoworks) PH stands for Optimized .goh file (Geoworks). 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 AS/400 ILE Software application development enters the litigious society How to Enable sites in SquidGuard Proxy Server with domain names using wildcards like *.ae?