#REF problem

[JL]

Hi,
I have a function that is referencing a cell from another
closed file.

For example,
=IF('C:\Temp\BL\Z_0503\[CO_CORHQ.xls]FX Exposure'!
$B$6='C:\Temp\BL\Z_0503\[CO_CORHQ.xls]FX Exposure'!
$G$11,0,'C:\Temp\BL\Z_0503\[CO_CORHQ.xls]FX Exposure'!
$G$52)

This same sheet (Microsoft Excel 2000) is running on 2
different OS (Win 2000 and Win XP).

When the sheet (C:\Temp\BL\Z_0503\CO_CORHQ.xls does not
exist. I'm expecting "#REF" error to show up.

It will in OS (Win 2000) but not in OS (Win XP).

Any idea/suggestion/fixes is appreciated.