Why not just "Save As" as soon as you open it and then add a suffix to the
file name, such as "test".

Then, do as you please with this duplicate test WB, without chancing any
revisions to the original.
--
Regards,

RD

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"Wanda" wrote in message
...
Hi all! Excel 2003 user here. I have several files on a shared network
drive. On occasion, I have the need to view only a file after I've opened
it. Other times, I may be working on a file and want to manipulate data
and
not accidentally save the changes once I've opened the file.

Is there a way to change a file to "read only" after it's opened, without
closing it and reopening as read only?

As always - thanks in advance!