Like this 

my $CopyFileW =  Win32::API::Wide->new(
    'Kernel32.dll',
    '
BOOL WINAPI CopyFileW(
  _In_  LPCTSTR lpExistingFileName,
  _In_  LPCTSTR lpNewFileName,
  _In_  BOOL bFailIfExists
);   ',
 );
$CopyFileW->( $from, $to );

[download]

Win32::API::Wide knows to args through Encode::encode('UCS-2' ... or whatever "unicode" means to windows

See also http://search.cpan.org/~dcmertens/FFI-1.04_01/ and Design Issues for Foreign Function Interfaces

In reply to Re: speak up Win32::API users by Anonymous Monk
in thread speak up Win32::API users by bulk88

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