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Category strings for MSI _Validation table
The "GUID" type needs to be written as "Guid" when used as a Category value inside the _Validation table.
What is the single letter prefix for each type?
Each type has a single letter used in the Column Definition Format [1]. For example, 's' is for Text and 'i' is for Integer. What are the letters for the other types?

[1] http://msdn.microsoft.com/en-us/library/aa367870.aspx