True if the TotalFileSize and TotalFileCount should include folders.
Warning: FileSize/FileCount are calculated in a background-thread,
so the correct result may take some time if the "file" is a folder
and files are located in it's subfolders (recursive calculation).
In that case, the default value -1 is returned if the calculation
could not finish in time.
This behaviour will be fixed soon (bug #2895).