Command completion allows you to type only a portion of a file name, and then have the system complete the rest by pressing the specified key. This is similar to the the UNIX shell command completion feature.
Open your registry and find the key below.
Create a new DWORD value, or modify the exist value called ‘CompletionChar’ set the value to equal ‘9’ (for the TAB key).
Exit your registry, you may need to restart Windows for the change to take effect.
Now when you type the first part of a filename then press the TAB key, Windows will complete the filename for you. Pressing TAB multiple times will scroll through all the options.
For Windows 2000 users you can also create an additional key named ‘PathCompletionChar’ to configure an alternate directory completion character.
Note:
Changing the value of ‘CompletionChar’ changes which key executes command completion i.e. ’09’ is the TAB key.
Key: [HKEY_CURRENT_USER\Software\Microsoft\Command Processor]
Value Name: CompletionChar
Data Type: REG_DWORD
Data: 09 = enabled (TAB Key)