What is .NL file?
Layout file created by Natron, a node-based compositor used to create visual effects for film and television; contains layout data that specifies how the application's workspace appears.
NOTE: The layout file is especially helpful for users looking to maintain the same layout without having to manually set it with each new project. To export or import a Natron layout, select [m]Layout[m] from the menu and whether you want to export or import the layout.
Recommended Software Programs to open .NL file