Based on your recommendation i wrote this:
use Win32::Unicode;
my $wdir = Win32::Unicode::Dir->new;
$wdir->open(@ARGV);
my ( undef, undef, $file ) = $wdir->fetch;
print join "\n", "length: " . length( $file ) . ", code points:", map 
+ord, split //, $file;

[download]
Which gives the below result, which is identical with the weirdly "upconverted" unicode above, and without further processing useless, as it doesn't map to anything but mojibake on any codepage known to me. (And ACP gives me 1252, sorry for speaking inaccurately about that.)
d:\>perl filename_check.pl RJ209072
length: 17, code points:
226
123
226
78
233
9524
196
113
233
9568
196
191
233
8976
233
189
50

[download]

In reply to Re^2: Win32 encoding conversion mystery by mithaldu
in thread Win32 encoding conversion mystery by mithaldu

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.