Command line options
Usage: 1by1.exe <audio file / folder / Cue sheet / playlist> <options>
Resume on start options:
/r Resume the last track and position
/rt Play the last track from the beginning
/rd Play the last directory from the beginning (depending on how it is sorted)

Other options:
/close Close the program after playing one track
/hide Hide the window and enable the Systray icon
/enqueue Enqueue the given file to the playlist view
/newinst Start a new instance ignoring the "Only one instance" setting
/localini Don't store the settings in the user profile