stickyb.....
Interesting.
Like you, I consider myself fairly "with it" on this front, regularly clearing out the obvious (and not quite so obvious) temporary files, but this one is new on me. ...Likewise mine is full of 'junk' (although not quite so dubious!) as is one of the adjacent files in "..........javapi/v1.0/" (sorry, can't remember which; cleared it out last night).
Suggestions from anyone on here of similarly unexpected files awaiting clean out would be useful.