A. A. When you use CMD.EXE, there are various extensions which are enabled by default. To enable/disable perform the following

  1. Start the registry editor (regedit.exe)
  2. Move to HKEY_CURRENT_USER\Software\Microsoft\Command Processor
  3. Double click on EnableExtensions
  4. Set to 1 for them to be enabled, or set to 0 for extensions to be disabled
  5. Click OK

You can also enable/disable them for a specific command session by using the appropriate qualifier to cmd.exe

cmd /y disables command extensions for this cmd session
cmd /x enables command extensions for this cmd session