luatex problem with file with umlauts on windows 10

Ulrike Fischer news3 at
Sat Apr 25 17:16:12 CEST 2020

Am Sat, 25 Apr 2020 23:52:25 +0900 schrieb Akira Kakuto:

Dear Akira,
> lua part is not utf-8 in TeX Live Windows. Please try:

After removing the two comments (--) it works fine, both in miktex
and texlive.

So chgstrcp.utf8tosyscp(file) is the secret. 

Why isn't it enabled by default? (e.g. depending on

(Currently the file search in expl3 is broken because of this, so
I'm considering our options).

Ulrike Fischer

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