Where is the API. So far I've been using existing gadgets to get an idea of how to create a gadget without an API document. I downloaded a file called Vectric_Gadget_SDK_V3.vgadget from one of the links in http://gadgets.vectric.com/developerinfo.html
. But I am unable to install or open it since it has a vgadget extension. I am on a PC that has the latest Windows 10 version.