Brilliant!
For years I've had a couple of add-ins that multiple users accessed from a shared network drive and always had hassle getting the timing right so I could update them when no-one else was on the system.
Setting them to read-only and using the method described above is going to make things a lot easier so thank you very much for having this post here
Note - the xcelfiles.com domain that is also referenced above no longer exists. However it can be accessed on the "Wayback machine" if anyone wants to get hold of the code that will let you know which user currently has a file open - also a great tool but doesn't work for 2007+ files (I'd post the link but not allowed until I've posted 5 times ... grrr).
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