The File Menu is mainly used for creating new projects and opening and modifying existing ones. It has the following options available in it.

imblogo New Project (Ctrl+N)
Create and setup a new PopGen project. This opens the Project Setup Wizard.

imblogo Open Project (Ctrl+O)
Open an existing PopGen project file (*.pop).

imblogo Save Project (Ctrl+S)
Save the settings of the project.

imblogo Quit (Ctrl+Q)
Selecting this quits the whole application.