Sounds like you're getting tripped up by the fact that Windows and the cmd.exe shell use different code pages.

D:\pscrpt>perl -e "print ord('£')"
163
D:\pscrpt>perl -e "print chr(156)"
£
D:\pscrpt>perl -e "print chr(163)"
ú
[download]

You need to convert between "cp1252" and "cp850" - for which you can use either Text::Iconv or (I believe) the Encode module. The latter, being a core module, is probably the "recommended" approach, though I've personally only ever used Text::Iconv.

Cheers,
Rob