A computer-implemented method and system launches an application with a preferred user interface (UI) language on a device. The method and system receive a voice command from a user to open an application on a device having a computer. The voice command is compared to a stored command language in an audio file device. The system and method initiates opening the application, in response to determining that the voice command matches the stored command language. The application is identified based on the voice command. The system and method determines a preferred language for the software application based on a language file stored on the computer readable medium and the language file being associated with the stored audio file. The method and system opens the application in response to the voice command, and sets the preferred language for a user interface (UI) of the device in response to the determined preferred language.