PLF format - t-oster/VisiCut GitHub Wiki
PLF is just a ZIP file containing the source graphic files (svg,png etc.) and some xml files containing VisiCut's settings. You can just rename it to .zip and then open it. It does not contain any information on the lasercutter, nor the code which is sent to it, because that code is generated on the fly once the lasercutter has been selected in VisiCut.