Acá tienes una rutina que te puede servir:
LOCAL loFileSystem, loDrive
#define FD_DRIVE 1
#define HD_DRIVE 2
#define CD_DRIVE 4
* Instanciamos el objeto
loFileSystem = CREATEOBJECT("Scripting.FileSystemObject")
* Recorremos los drives
FOR EACH loDrive IN loFileSystem.Drives
WITH loDrive
IF (.IsReady) THEN
IF .DriveType = CD_DRIVE
? "CD-ROM", loDrive.DriveLetter+":"
ENDIF
ENDIF
ENDWITH
ENDFOR