Why don't you just use excells own password protection, Save your
workbook using "Save As"
any name but before you do click on the dropdown with the titled Tools
in the save as dialog box,
choose "general options" click the read only recommend and add a
password to modify!

Now when they try to open the workbook they will need a password to
change anything or
they can view it "Read Only"

Regards,
Simon


--
Simon Lloyd