Relevant answers of windows

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• What symbol cannot be used as a windows file name?
  an asterisk
• What is the name of the executable program file used to launch windows explorer or the windows?
  Explorer.exe
• What is the name of the third file windows you added to store the registry that was not used?
  Classes.dat
• What is the name of the third file Windows ME added to store the registry that was not used?
  classes.dat
• Name a Windows 9x file that is hidden?
  Io.sys