if you think this is wrong, send files to avast lab for correction

You can upload files and report issues to avast lab here: http://www.avast.com/contact-form.php (change subject according to Your case)

you can use mail
send to virus@avast.com in a password protected zip file
mail subject: False Positive / undetected sample (select subject according to your case)
zip password: infected

or you can send files from avast chest
how to use the chest. http://www.avast.com/faq.php?article=AVKB21