There is only one file type that uses the .NXG extension:
eSite Builder NXG Web Page
Web page created with eSite Builder NXG, an online Web development environment that provides a WYSIWYG ("What You See Is What You Get") interface for creating and updating Web pages; typically built from an eSite Builder NXG template.
If a web address ends in ".nxg," the webpage is most likely hosted on a server running eSite Builder.
NOTE: Motorola eSite Builder NXG is no longer available for download.
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Updated: September 28, 2016