luatex problem with file with umlauts on windows 10

[Ulrike Fischer]

Am Sun, 26 Apr 2020 00:51:01 +0900 schrieb Akira Kakuto:

Dear Akira,


>> Currently the file search in expl3 is broken because of this, so
>> I'm considering our options
> 
> f = chgstrcp.utf8tosyscp(file)
>     (file: utf-8, f: local code page)
> 
> f = chgstrcp.syscptoutf8(file)
>     (file: local code page, f: utf-8)
> 
> work only in lua[hb]tex for TeX Live Windows.

How does the functions know how to convert? I mean how is the "local
code page" defined or queried?

> Please use them in expl3, if they are usable.

Yes, I think we will do it. Thanks.

-- 
Ulrike Fischer 
https://www.troubleshooting-tex.de/