Ideas? It's seems it's all about tricking the installer to think the data is a file on the harddrive.

Which would have nothing to do with perl. There's no point in trying to trick the installer.

use File::Temp 'tempfile';
my ($fh, $filename) = tempfile( UNLINK => 1, OPEN => 1 );
print {$fh} <DATA>;
close $fh;
system @yada, "/fl", $filename;
__DATA__
yada
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