code: public String getTextureFile(AiTextureType type, int index) {
          checkTexRange(type, index);
          
          return getTyped(PropertyKey.TEX_FILE, type, index, String.class);
      }
docs: Returns the texture file.<p>
  
  If missing, defaults to empty string
  
  @param type the texture type
  @param index the index in the texture stack
  @return the file
  @throws IndexOutOfBoundsException if index is invalid