Thanks for the sensible suggestion!

I put an SSCCE together, which produces this output with strawberry-perl v5.38.0 under Windows 10 (default file system type, I guess): 

perl -w .\TestFileOpsWithUTF8_Names.t
1..2
ok 1 - check -f with non-UTF8 file name
not ok 2 - check -f with UTF8 file name
#   Failed test 'check -f with UTF8 file name'
#   at .\TestFileOpsWithUTF8_Names.t line 18.
# Looks like you failed 1 test of 2.

[download]

#!perl
use strict;
use warnings;
use Test::Simple tests => 2;

my $fnameNoUTF8 = q{ß};    # some character that is present in Latin1,
+ but not in ASCII
my $fnameUTF8 = $fnameNoUTF8;
utf8::upgrade($fnameUTF8);

# create an empty file with a NON-ASCII file name
open my $fh, q{>}, $fnameNoUTF8 or die "could not create file $fnameNo
+UTF8:$!";
close $fh or die "could not close file $fnameNoUTF8";

# test for this file with original name
ok( -f $fnameNoUTF8 , "check -f with non-UTF8 file name");

# test for this file with UTF8-upgraded name
ok( -f $fnameUTF8 , "check -f with UTF8 file name" );

#cleanup
unlink $fnameNoUTF8 or die "could not unlink file $fnameNoUTF8";

[download]

In reply to Re^2: utf8::downgrade() and file system operators by hexcoder
in thread utf8::downgrade() and file system operators by hexcoder

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