It's a light version of DSC (Quake III Arena demo player) with Point Release 1.32 compatibility.
Look at the context menu for demo files. Double click a demo to play it. Convert a dm3 demo to the dm_48 format.
Open the properties window of a demo, save demo and player descriptions (only dm3 and dm_48 demos for now).
Switch Q3A version manually via shortcuts.
Plays all Q3 demo versions up to dm_68