There is only one file type that uses the .NXL extension:
Nextlabs Encrypted Data File
An NXL file is an encrypted data file created by SkyDRM, a program for protecting sensitive information from unauthorized access. It contains a file, such as a .PDF, .JPEG, or .MP4 file, that is secured with SkyDRM encryption. NXL files can be configured to be accessed, edited, read, shared, and printed by specific people.
SkyDRM is a cloud service designed for organizations who need files that their employess access to be secure. It can be integrated into other cloud services and applications too.
Updated: September 25, 2016