When I print the file path

Make sure that the terminal system you are printing them on supports those characters (make sure it supports ISO Latin 1). If in doubt, use ord in a loop to print out the value of each character to make sure no conversion is going on. For example:

my $filename = 'è or å,ä,ö';

for my $char (split '', $filename) {
    printf ("%02x ", ord($char));
}
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