'Unknown encoding 'UTF16' at sample.pl...'.

You want "UTF-16" or "UTF-16LE". See Encode::Unicode. Also, Encode has from_to, so I'd probably write

use Encode qw(from_to);
open (FSIN, "$_")||die ("Unable to open SGML.3d file $_");
my $sfile = <FSIN>;
from_to($sfile,'UTF-16LE','ascii'); # or latin1, iso-8859-1 ...
[download]

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

Shmem, Still I'm getting the same error --B

Looking into the Encode Module -

sub getEncoding
{
    my ($class, $name, $skip_external) = @_;

    ref($name) && $name->can('renew') and return $name;
    exists $Encoding{$name} and return $Encoding{$name};
    my $lc = lc $name;
    exists $Encoding{$lc} and return $Encoding{$lc};

    my $oc = $class->find_alias($name);
    defined($oc) and return $oc;
    $lc ne $name and $oc = $class->find_alias($lc);
    defined($oc) and return $oc;

    unless ($skip_external)
    {
        if (my $mod = $ExtModule{$name} || $ExtModule{$lc}){
            $mod =~ s,::,/,g ; $mod .= '.pm';
            eval{ require $mod; };    <--- HERE
            exists $Encoding{$name} and return $Encoding{$name};
        }
    }
    return;
}
[download]

it seems that on the line marked with <--- HERE the necessary encodings are loaded at runtime. I don't know about perl2exe, PerlAPP or such, but it will definitely not know what modules your script needs without running it.

Put this at the end of your script:

print STDERR "$_\n" for grep {/Encode/} sort keys %INC;
[download]

and include explicitly any Encode/*.pm files you see. I guess you need to include, Encode/Unicode.pm, so start your script with

use Encode;
use Encode::Unicode;
[download]

--shmem

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

Maybe you need binmode on that filehandle? Windows almost always needs binmode.

---

I'm not really a human, but I play one on earth. Cogito ergo sum a bum

At first glance, it would appear that whatever you're using to convert from .pl -> .exe is not bundling in the modules you're specifying in your code (Encode by the looks of it). What are you using to do the conversion?

I'm using following module for the conversion. use Encode; I'm unable to paste my input file here. I would like to give some more information: If i open the input file in the word (Confirm conversion at over - enabled). It is opening under 'Unicode' mode. If open the same file in notepad, wordpad and few text editor(UltraEdit), it is giving proper output. If i open this in other text editor (Epsilon, Emacs), it is showing junk characters.

Yes, but what are you using to convert your Perl script to an .exe? PAR, PerlApp, something else? That's going to be where your problem is by the sounds of it.

Encoding UTF-16 requires that a BOM be provided in the data to decode to determine whether UTF-16le or UTF-16be was used. The error you are getting is the error that is generated when the first character is not a UTF-16le or UTF-16be BOM character.

To decode UTF-16le data without a leading BOM, specify UTF-16le as the charset.
To decode UTF-16be data without a leading BOM, specify UTF-16be as the charset.

Update: Nevermind. That's not the error message given by the case I've explained.