The details about the image file is available on the File Details tab.
Picture ID: This is the unique identifier assigned by FotoAlbum to this picture. The ID will never change for a picture, even if the picture is changed (i.e. rotated, modified, etc).
Filename: The filename of this image.
Folder: The folder (path) that this image is located.
Filesize: The size of the image.
CRC32: The unique 32-bit CRC value computed for this image. This is used to help determine if a picture has been modified. In most situations, two images will never have the same CRC value.
Filedate: The date this image was saved or updated.
Pic Modified: The last date the image was modified. This can be different than the filedate due to the way Windows tracks the filedate. This is the date used to help determine whether the image on your PC is newer than the one on the Web.