[tex-live] TL2018: Problems with filenames

[David Carlisle]

https://stackoverflow.com/a/2051018/1158383

suggests that although windows uses Unicode file names it cunningly
hides that fact from file open calls :(

It appears miktex is using the unicode filename api rather than the
default "ansi" one, I don't know if texlive could do similar?

https://sourceforge.net/p/miktex/bugs/2068/

(I should make latex more robust for non utf8 filenames in any case)

David