From the help of the Batch Utilities:
To generate a list of all design files used in the current model
In Autodesk Navisworks application, open the desired Autodesk Navisworks file, and click Home tab Tools panel Batch Utility .
The Autodesk Navisworks Batch Utility dialog box is displayed, and the path to the current model is automatically added to the Input area of the dialog box.
In the Output area, As Single File tab, click the Browse button.
In the Save Output As dialog box, browse to the desired folder, and enter the name for the text file.
In the Save as Type drop-down list, select the File List (*.txt) option, and click Save.
