Can it extract audio from MP4 & other video ?

I have Win7 32bit.

Can Audacity extract the audio from a MP4 file into a Mp3 or WAV file ?

If so, is there a link to an easy guide to do that ?

Many thanks

You need to have FFmpeg installed: http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#ffdown

Then see here: http://manual.audacityteam.org/o/man/tutorial_editing_an_existing_file.html