Understanding Files types

The default folder view contains templates based on the units and drafting standard you selected when you installed Autodesk Inventor.

Autodesk Inventor file types include:

Part (.ipt)
Sheet metal part (.ipt)
Assembly (.iam)
Weldment (.iam)
Presentation (.ipn)
Drawing (.idw)
Drawing (.dwg)

NoteParts and Sheet Metal parts share a common icon as do Assemblies and Weldments.
Templates that support different standards are available on the English and Metric tabs.