There is only one file type that uses the .VXML extension:
Text file containing code written in VoiceXML, an XML based language used for vocal interaction between a human and computer; typically contains speech recognition and speech synthesis functions that allow a computer to interact with a human via voice commands.
VoiceXML is commonly used to process voice commands received by users via telephone. Examples include selecting menu options, getting driving directions, and tracking orders through and automated voice recognition system.
The W3C (World Wide Web Consortium) supports VoiceXML as a Web standard. The first draft of VoiceXML 3.0 was established in November, 2008.
Updated: December 12, 2016