There are 2 file types use the .NL file extension:
1. Natron Layout 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.
Updated: October 30, 2014
2. Note Ledge File
Note file created by Kdan Mobile NoteLedge, a note management application for mobile devices; contains notes consisting of text, drawings, video or audio; includes date and location when the file was a created; can be exported as a .PDF or .JPEG for easy sharing.
Updated: October 22, 2015