These formats are called projects, each loaded Project is displayed in The Project List . The frames of the currently selected project are displayed in The Frame List.
A preview of the currently selected frame is available in The Preview Window, the preview window offers video and audio preview.
You can load a new Project with the Open item of the File menu or by dragging the file icon into the project list.
Also, you can change the relative size of the windows by simply changing the location of the sliders which separate them.
A project is either an animation, one or several pictures or a sound. An animation or sound is always a project of its own, the name of the project will be the name of the animation/sound.
Pictures are handled differently. All pictures of a given format are grouped together in one project, the name of the project will be the name of the format of the pictures, like IFF or JPEG. This way you can group any number of pictures together and convert them into an animation.
Every project has its own pop-up menu which is identical to the Project menu. If you press the right mouse button in the container's whitespace, the File menu will be shown as a pop-up menu.