You can view the inner structure of a SWF file - its resources and their number – in SWF Resource Panel:

1. The file name is displayed on the top of SWF Resource Panel. You can see whether it is a Flash or Flex file: you'll see
or
icon.
2. Click the file name to load the file to Player.
3. Click
or
buttons to preview objects of a certain group.
4. If you click the item in SWF Resource Panel, you'll see its thumbnail in Thumbnail bar (if it is shown). Moreover, the item chosen will be displayed in Player. You will also see Tag info of the selected file.
5. Moreover, here you can choose which group of objects or what resources to extract by ticking the corresponding checkboxes.
You can show/hide SWF Resource Panel by clicking "Resources" button on the right border of this panel, or go to Main menu --> View and click "Show resources" option.
You can customize Main Window workspace by dragging SWF Resource Panel, thus getting more space for Player.
You can also see all the information about the file, currently displayed in Player, in Resources chart:

Resources chart provides info about the total number of file's resources, file size, the size and number of objects (e.g. images).
You can show/hide Resources chart in Main menu --> View -> Show Resources chart, or just click
Status bar button.