Use Tab key for auto-complete in Command Prompt

Open notepad and create a file with following content:-

------------------ Start from following line --------------
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor]
"AutoRun"=""
"CompletionChar"=dword:00000009
"DefaultColor"=dword:00000000
"EnableExtensions"=dword:00000001
"PathCompletionChar"=dword:00000040
------------------ Copy until this this line -----------------

Save the file as 'cmd.reg'. Then double left click to update the registry.

DONE !!!