## Set Action Test State from File Type

This function is used to set the action test state based on the type of file being processed. (m4a, m4b, m4v and mp4 files all fall under MPEG-4). The action test state is set to true if any of the files being processed are one of the selected file types, otherwise it is set to false. Remember that when running groupwise only one file is being processed at a time.