Have you tried it?

I mean have you tried to write your data from the original excel (e.g. read.xlsx) file to the (e.g. write.xlsx) file?

I post also a sample of code on how to create a new file.xlsx and insert your data.

Let me try to make it more clear, read your data from 'UE_NW_Parameters.xlsx' with Spreadsheet::Read as you are currently doing. Store the data in @rows (as you are currently do in). Then detect all the elements you want to modify (as you are currently do in) and update them in a new @rows_2 (array).

As a final step use Excel::Writer::XLSX module to create a new.xlsx file with the updated values that you have in @rows_2.

Reposting sample of code tested on LinuxOS on how to write the data:

#!/usr/bin/perl
use strict;
use warnings;
use Excel::Writer::XLSX;

# Create a new workbook called simple.xls and add a worksheet
my $workbook  = Excel::Writer::XLSX->new( 'a_simple.xlsx' );
my $worksheet = $workbook->add_worksheet();

# The general syntax is write($row, $column, $token). Note that row an
+d
# column are zero indexed
#

# Write some text
$worksheet->write( 0, 0, "Hi Excel!" );


# Write some numbers
$worksheet->write( 2, 0, 3 );          # Writes 3
$worksheet->write( 3, 0, 3.00000 );    # Writes 3
$worksheet->write( 4, 0, 3.00001 );    # Writes 3.00001
$worksheet->write( 5, 0, 3.14159 );    # TeX revision no.?


# Write some formulas
$worksheet->write( 7, 0, '=A3 + A6' );
$worksheet->write( 8, 0, '=IF(A5>3,"Yes", "No")' );


# Write a hyperlink
my $hyperlink_format = $workbook->add_format(
    color     => 'blue',
    underline => 1,
);

$worksheet->write( 10, 0, 'http://www.perl.com/', $hyperlink_format );
[download]

I do not have WindowsOS to test the code but 99% it should work perfectly.

Update: I searched on the web a bit more and I found also this useful tutorial How to read an Excel file in Perl, which contains examples on how to read and write excel files in Perl and How to create an Excel file with Perl? which will guide you how to write on excel files.

Hope now it is more clear, let me know if something is not clear.