File viewer
In order to register a file into File viewer, you select "Regist file" from the menu which right-clicks control, or drop the target file directly. When taking out the embedded file, you select "Save data" from a right-click menu. And for deleting the registered file, you select "Remove file".
Thumbnail images are created from registered files and those are shown preferentially. Therefore, image quality may deteriorate depending on the registered picture file, or a background color may become black. But, original data are not changed and you can take out the data of a original data at any time.
You can change the showing method in File viewer by Configure.