Adding a unix layer makes no sense. I suspect both the existing unix layer and the one you add are trying to close the handle. Of course, only one will succeed. Do you have the problem if you use the following without binmode? 

$fh->open("<:unix $filepath")

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I would never use that, though. The following is the same, but provides buffering: 

$fh->open("<:perlio $filepath")

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The best solution is probably the following, though. 

$fh->open("< $filepath");
binmode($fh);

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Although I'd write it as 

open(my $fh, '<', $filepath);
binmode($fh);

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In reply to Re: Closing a filehandle in ":unix" layer doesn't work on Win32 by ikegami
in thread Closing a filehandle in ":unix" layer doesn't work on Win32 by rovf

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