The Desktop and Finder illusions rely on files having a type and creator, and an icon association. These were kept in the Desktop Database, and are now the responsibility of Launch Services.
For any company to put more effort and expenditure into its packaging than its documentation is hardly user-oriented.
A friend is giving me a Mac LC 475, but when it is powered up the display shows a white floppy disk with a flashing ? against it. What does that mean?