1. Appearance.2DA
(Resources/Technical Documentation)

... model resource to use. Using a ? will let the engine determine the model based on gender. See Model Naming Conventions for technical information. NWN2_Model_Helm  Name of the model resource to use. ...

2. NWN2 Model Naming Conventions
(Resources/Technical Documentation)

The toolset categorizes models based on how they are named. A 3 letter code is used, with the first 2 letters signifying the race (see race codes below), and the last letter the sex (see gender code below). ...