I've created some spreadsheets for this purpose, set up so that I can just copy and paste in .quad file and see the graph. I set it up for curve comparison so in fact I can paste in two curves, and plot them separately and against each other.
The problem with QTR on Windows is that the chap who wrote QTRGui as a graphical front end for command line QTR-on-Windows has long since vanished, and Roy has no way of coding for Windows last we heard.