Can't always find XLA file

[Carl L]

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