Single Excel instance with multiple windows

[BrianB]

In Word 2003, when I open multiple doc files using File > Open, there is
only one instance of WinWord.exe in Task Manager but each doc file has an
independent Word dialog window. Clicking the red X will just close the
current doc file.

In Excel 2003, when I open multiple xls files using File > Open, there is
only one instance of excel.exe in Task Manager and only one Excel dialog
with each xls file arranged within that dialog.

I understand that Excel 2003 (and I think 2007) only works this way. If I
want each xls to have a separate dialog I have to open an instance of
excel.exe for each xls file, which wastes PC resources. Clicking the red X
will close ALL xls files, not just the current xls file. (Yes, I know I
should click the little black X right below the red X, but habit wins when
almost every other application uses the red X to close just the current
file.)

Is there a way to have one instance of excel.exe and multiple dialog windows
that I have not found? Or has MS improved Excel 2010 to work more like Word?

If not, I know that it's too late for Excel 2010, but where can I submit a
product improvement suggestion with MS?

Thank you
Brian Bygland