Do the 2 files have extensions? Or is it just they have real player icons? For OS 9 I think your options are limited. For OSX WireTap can play & convert real player files but I can't remember if they offer an OS 9 version. Since Realplayer formats are patent, not many mac devs are willing to pay the licence fees to provide an app that can play or convert those files. And they didn't seem too keen to pay them before OSX came around. Either get RP again or ignore those files. WMP is "supposed to" be able to play rp files but the mac versions doesn't in my experience.

BTW I would recommend getting a hold of Audion (click on link) as it plays many formats that iTunes is unable to play. (but not rp or wma files!) And it's now free!