Can't read from messagefile

[rs51]

hi again
in my atempts to solve my case i run the mysql site sugestion and made this:
shell>C:\mysql\bin>mysqld-nt --language=portuguese
but i got this answer:
031019 18:21:20 Can't read from messagefile 'c:\mysql\share\portuguese\errmsg.sys'
031019 18:21:20 Aborting

So, i guess i need a new errmsg.sys file, but i allready googled and found nothing.
What should i do?
thanks in advance