In my old times of Pro/E, there where a similar file recording all mouse clicks, features and options.
We could recover from "fatal" errors or change the model by editing this text file and running it with Pro/E (we could see the model growing fast on screen).
So the Pro/E file was, sometimes, very usefull.
And, how about swxJNRL.swj? Do you find it usefull at all?
Regards