Now we're getting somewhere (I think). You should be able to take advantage of Perl's :crlf IO layer to handle the problem for you.
I'll let you test this yourself I've tested this, and here is how I think it would work out.
First, Tie::File seems to be "layers" unaware, which is fine, except that you'll have to open the file explicitly, and close it again when you're done, rather than letting Tie::File handle those operations. This gives you control over what layers are applied to the file handle.
use Scalar::Util qw( weaken );
open my $fh, '+<:crlf', 'filename.ext' or die $!;
my $t = tie @array, 'Tie::File', $fh;
weaken $t; # tie holds its own ref. We don't want a mem leak.
# Work, work, work...
close $fh or die $!;
The relevant explanation of ':crlf' from the POD is: " On read converts pairs of CR,LF to a single "\n" newline character. On write converts each "\n" to a CR,LF pair." Since this happens behind the scenes, it should play nice with Tie::File, but I would test on some copies of the files first to be sure.
Updated: Added weaken to eliminate a potential memory leak, since tie also holds a ref to its own object.
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