VXML - VoiceXML File is a great file extension that you can use for voicemail interactions between the computer as well as the human. It is basically a XML language base that is used for vocal interaction between the two. This file extension actually comes in handy because it consists of speech recognition as well as speech synthesis functions that are pretty common. It is mainly used for being able to process voice commands and much more. These commands are those that are received from telephone users. Menu options and getting driving directions are just a couple of options that you will receive when dealing with this file extension. You will be able to gain pretty much a lot when you use it.