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## early on..
$filepath = '/dir/of/file/';
...
## later on...
$d = join("','", @files);
$d = "'" . $d . "'";

$file1 = '/dir/of/file/filename1.txt';
$file2 = '/dir/of/file/filename2.txt';

## then send both variables to the module:
$file1,$file2