-- vote for not providing enough information for us to avoid giving advice that you already have discovered doesn't work for you.

...although... I don't have a handy copy of Windows here, but I have to wonder why the documentation for Cwd contradicts your experience:

The getdcwd() function is also provided on Win32 to get the current working directory on the specified drive, since Windows maintains a separate current working directory for each drive. If no drive is specified then the current drive is assumed.

This function simply calls the Microsoft C library _getdcwd() function.