Comment 1 for bug 1785191

I confirmed that any character greater than 255 will cause the source file name to fail. Fixing this will likely not be trivial since kicad2step is run as an external process and the file name is passed via the command line and kicad2step parses the command line with wxCmdLineParser which hides the command line character parsing in wxAppConsole. Maybe it's time to move all of this inside kicad proper and get rid of kicad2step as an external utility.