These garbled strings are accompanied by the error message "Wide character in print"
How are you opening the .ini file for output - try this if not already: 
open ( my $fh, ">:encoding(utf8)", "file.ini" ) or die "file.ini: $!";

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In reply to Re: Processing spreadsheet with some cells in ASCII, other cells in UTF-8 by tangent
in thread Processing spreadsheet with some cells in ASCII, other cells in UTF-8 by Amphiaraus

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