Re: Our IT support does this sort of thing daily.
And therein the point: if there were critical bits of code missing, that engine should never have started.
That said, the phrase 'file' could simply be a translation through three layers of lawyers, PR bods, and reporters when what might have been meant was 'array' or something similar; something baked into the executable which might have started life as a file on someone's workstation, but which is thereafter internal to the finished software... just guessing here, of course. But if that's the case, no amount of checksums and hashcodes is going to find the missing data; you'd actually need to check that the data itself existed *and* made sense. If it's gone missing at the compile stage, that's a different problem.