I can't say much in terms of coding involved, but smilies can also be drawn from external sources. It may simply not be capable of recognizing different types. Some websites also limit the usage of their own smilies, because a number of them these days are animated, which can consume just as much bandwidth to load and display as a normal picture would.
R5 100 GRD Marevayave - Leader of [U][B]Riddermark[/B][/U]ed For Death
R8 100 MNS Fayah/100 LM Siennah/100 HNT Dinenol/100 RK Dhurik
100 CHN Alachas/85 CPT Dinfaerien/60 BUR Dhax/35 WDN Godoric
R9 100 MNS Fayeh (alt Wilya) - Lonely Mountain Band @ [U][B]Landroval[/B][/U]