Specifies the Project Subtype (if any), as a string, of the template. This value specifies the aggregate project system for ...

Specifies the Project Subtype (if any), as a string, of the template.  This value specifies the aggregate project system for an Item Template.  Possible values include: SmartDevice-NETCFv1, SmartDevice-NETCFv2.  For Web projects, possible ProjectSubTypes include: CSharp and VisualBasic.