In the program's menu, what are Parameters and Start Folder? Clicking the program Next File actually plays the next file using (in my case iTunes). Shouldn't it only show the path of the file?
The Parameters menu allows you to pass various related parameters to file playback. You can find more about it in the help menu. The Start Folder is used to define the folder where the application should start searching. This is a common setting on most of the apps. You can specify the path of the folder to point anywhere on your hard drive. Alternatively, use the Usage Guide file available for downloading from the official website. You will find all the Parameters explained in the context.