There is only one file type that uses the .JWL extension:
Roxio Jewel Case File
Label file created by Easy CD Creator, a program used for creating and printing CDs; contains the locations of all template, theme, picture, and icon resources associated with a jewel case image; used to print a CD label, or jewel case cover.
JWL files are replaced by newer formats used in Roxio CD software, but they can be used by Easy Media Creator version 10 or earlier.
Updated: November 22, 2009