Systems and methods are disclosed for launching a child application to perform functions on a document created by a parent application without the need for integration of the child application within the parent application. In one implementation, a system detects a child application available for activation by a processor of a computer and determines what functions the child application can perform. The system then determines that the function can operate on an open file, and once the system receives a selection of the function, the system launches the child application and performs the function on the open file. In another implementation, the system determines that the function may operate on a plurality of open files, creates an interface that allows selection of one of the plurality of open files, and launches the child application and performs the function on a selected file.