Yes i can download & share all or any formats. Make sure those extensions are added to your share extension list .. from memory either under save or share option window in preferences. Also go to your Tools > Options > FIlters > Keywords & make sure those extensions are NOT on the list.

For WMP to play m4a, you will need a plug-in to enable it to play.

Also, see this link about showing particular file types on search results: http://www.gnutellaforums.com/limewi...filtering.html

BTW have you tried searching just .m4a