I have run into a problem where the path to a XLA file is not always correct
on systems that are using a roaming profile.

When I launch Excel from my desktop the path to the XLA file is correct.

The problem occurs when Excel is launched by IE when selecting a XLS file
from a web page. I have the "Browse in same window" option turned off so
Excel is launched in its own window. The drive letter of my roaming profile
network drive (T:) is used in the path to the XLA file rather than the drive
(C:)
the XLA file is installed on.

How does Excel build the path to the XLA file? In particular how does it
pick the drive, and is there anything I can do to influence this behavior?

Thanks,

Carl