The SDK’s only guarantee upgrade compatibility of data and compatibility between the same Major version (.NET 2.0 and Java 2.0 for example) and SDK (.NET 1.X and .NET 2.X).
This is actually just a missing feature in the SDK; I created a ticket for adding it: Loading...
I included a brief “how to do it”, so if you feel inclined you can always take a stab at it and submit a pull request. If you chose to go this route and need any help or clarification, let me know!
-Jeff