File with a .GAN extension contains a plan of a project – a tree of tasks with their deadlines and list of resources. Files are based on the XML format and can be imaged in form of Gantt schemes with proper software.

GanttProject, for which the GAN is a native format, is an inter-platform open source application used for planning and managing projects. It was created in the Java language and it currently provides wide possibilities to create diversified charts and structures.