See also Microsoft’s Knowledge base article at http://support.microsoft.com/kb/817578
NAME? reference / moving between users
If you create a spreadsheet that is going to be moved between users or supplied to a user who does not have a PaXcel license then you should take the following points and issues in to consideration:-
ISSUE: When you click on a PaXcel toolbar icon nothing happens
ISSUE: After re-installing PaXcel and starting Microsoft Excel the PaXcel toolbar is not available and PaXcel does not appear under the View | Tool bar menu option.
When attempting to link the PaXcel add-in into Excel, after clicking the browse button and selecting the Paxcel?.xla file and then clicking the OK button on the Excel Add-in’s screen, I receive the message “PDIPaXcel?.dll (where ? is the version number) missing. This should be installed into a directory which exists in the path environment.”