Files are copied, folders are not from CD-ROM with Explorer

1. Open an Explorer window, navigate to the target folder on the hard disk.
2. Open another Explorer window, navigate to the source folder on the CD-drive.
3. Mark files and folders
4. Drag them from the CD-drive and drop on the hard disk folder.
Explorer starts "moving", but effectively only file are copied. Performing the same within the hard disk works as expected.
Tested on Release 0.4.3 and Build 73532.
Correct behavior would be:The folders are also copied.