如何将HP LaserJet 5生成的PCL转换为C＃中的PDF？

I need to retire 15 years old system and preserve all data. It can only print documents into specific printer HP LaserJet 5. I can print documents into PCL files and looking for ways to convert all this files into PDFs programmatically. Preferably in C#. Can anybody recommend good library or command line tool? Preferably free ;-)I need to retire 15 years old system and preser