Have you tried the Endnote user forum - they may have an answer.
http://forums.thomsonscientific.com/...ory.id=endnote

"Erica" wrote:

I am not sure how to refernce Excel fsoftware in Endnote for an academic
article. Previously I had merely noted the name of the software and the date
of the version. Now my supervisor wants it referenced in Endnote. I am
finding it difficult ot fill the information cells to get a reasonalbe output
from Endnote. Is there a downloadable Endnote imprt to correctly upl;oad the
information?

Thank you

Erica