With Filestar you get 0 different skills for working productively with PCL XL Print Job (.plt) files.
About .Plt
Name
PCL XL Print Job
Extension
.plt
Format
Binary
Category
Document
Developer
Hewlett Packard
Description
A printer job captured with Windows print-to-file through a PCL 6 (PCL XL) driver; not the HP-GL plotter format that shares the .plt extension. Filestar cannot convert it - print the document as PDF instead (choose a PDF printer), then convert that PDF.