FYI the registry setting is shown in the picture below.
Note however, that it is profile dependent. So the best way would be to do it automatically is with a .NET addin. However, some might have a valid reason to SaveAs temporarily, like working with a consultant who doesn't have the latest software. So the best way would be to just send out a memo with the instructions to go to Options>Open and Save tab>Save As. It may not matter much though, because the default is to automatically upgrade to the current version upon file open. The only problem with saving to an earlier version is that some new features may be lost, due to the fact that an option was not available in the older software.
Ed
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