Systems and techniques are disclosed for transmitting a message through an application integration system without having to converting the message from a format that native to both a sending application and a receiving application. A computer-implemented method for transmitting a message from a sending application through an application integration system includes determining a receiving application of the message, and determining a file format used by the receiving application. If the file format used by the receiving application is substantially identical to a file format used by the sending application, the method includes wrapping the message in a markup language file envelope according to a markup language used by the application integration system. The message is then routed in the markup language file envelope to the receiving application.