Must be part of the content included with the plug-in with either X2 or X3 (maybe older versions too but these are the only X series I have installed). The default path could be either "C:\Program Files\Cakewalk\Vstplugins\RXP\Contents\Loopmasters\Lounge & Chillout\Sequences" or "C:\Program Files (x86)\Cakewalk\Vstplugins\RXP\Contents\Loopmasters\Lounge & Chillout\Sequences"
An Advanced install of RXP using X2 or X3 should get the bundled RXP content back.