Files with jlt file extension can be found a special print files from HP Smart Stream program.
JLT file extension - HP SmartStream print data
What is jlt file? How to open jlt files?
File type specification:
The jlt file extension is used for a print data file that is send to a printer together with an eps file when a project made in HP SmartStream during printing.
The jlt file contains all of the static reference elements, fonts, etc.
This jlt file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.