Only WAV files can be embedded and only if they are smaller than the
setting for "Link sounds with file size greater than" (found in Tools
menu, under options, on the General tab).
If the sound files are not embedded, you can either copy the sound files
to the same folder as your presentation and then insert them, or you use
Package to CD or Pack and Go (depending on your version), and it should
automatically gather the linked files for you. You might check out this
FAQ for more information:
http://www.rdpslides.com/pptfaq/FAQ00155.htm
--David
--
David M. Marcovitz, Ph.D.
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_
http://www.loyola.edu/education/PowerfulPowerPoint/