Hi, I created a new composite datatype (class derived from Html class) myDatatype and I sucessfully use it in a new created tool. When I click on "View data" it shows my Html file with a list of binary files and everything is Ok. Now I would like to Visualize my data. I created a new directory in galaxy-dist/config/plugins/visualizations/ following instructions given at https://wiki.galaxyproject.org/VisualizationsRegistry and read https://wiki.galaxyproject.org/VisualizationsRegistry/Configuration and https://wiki.galaxyproject.org/DataProviders However, I still don't understand what I should do to be able to access files from my composite datatype to be able to visualize myDatatype (I mean I need to visualize the files containing in the directory listed by the html file). Is it possible? Where can I find some information on how to do it? Thanks, Anne.