File Extension SOH File Format Colour palettes and various style elements file SOH stands for Colour palettes and various style elements file. 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 Outlook 2010 Rules and / or Operator SQL Query Perfomance Issue. How do I code this?