NWAddIn.xla - compiled for Microsoft Excel 97-2003
NWAddIn.xlam - compiled for Microsoft Excel 2007
For instructions, read How to extend the functionality of Microsoft Excel to aid in the management and monitoring of Novell Netware servers and volumes in the Novell Developer Community wiki.
Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).
It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.