You can call it a bug if you want, but MS calls it as something outside
the specification of XL. I've filed a bug report about this -- and a
slew of related problems, which I assume you haven't discovered yet --
and appealed the initial closure of the bug report. Nonetheless, it
was closed with the end result that XL doesn't allow characters in
filenames that are OK with the OS.

In fact, if you know how (or accidentally as in my case) it is possible
to even create a sheet with disallowed characters in its name! XL will
handle such a sheet but in a limited manner.

The eventual result may (will?) be a series of unexpected XL errors but
that's the way it is.

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

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Thanks Julie - bug confirmed.