playing mp3 file through pc's speaker without shield

is it possible to get voice output or mp3 file without shield. if shield needed then which one? can you help me with the code ? i want to make a password lock . when password matches; then there will be a voice output saying password matched.

You can get about 3 seconds of sound in an Arduino, otherwise you have to go to a shield. The AdaFruit wave shield is a good choice.