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DWORD GetShortPathName(
  LPCTSTR lpszLongPath,  // null-terminated path string
  LPTSTR lpszShortPath,  // short form buffer
  DWORD cchBuffer        // size of short form buffer
);

use Win32::API;

...
$shortname = substr($shortname,0,$retval);

print "longname = \n\"$longname\", \nshortname = \n\"$shortname\"";

C:\temp>perl shortname.pl
longname =
...
shortname =
"C:\PROGRA~1\MICROS~3\Office\OLREAD9.TXT"
C:\temp>