also check your perl verision if it can deal correctly with large files:

D:\>perl -V
Summary of my perl5 (revision 5 version 13 subversion 11) configuratio
+n:

  Platform:
    osname=MSWin32, osvers=5.1, archname=MSWin32-x86-perlio
    uname=''
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=und
+ef
....
[download]

Or just

D:\>perl -V:uselargefiles
uselargefiles='define';
[download]

if it isn't, then upgrade