아래 링크에서 찾은 자료입니다.
 http://groups.google.co.kr/groups?q=mozilla+realplay&start=10&hl=ko&newwindow=1&selm=3C009CE9.2A745DF4%40yahoo.com&rnum
=11 그리고 음악 테스트는 아래에서 한번 해보세요. http://may23th.new21.net/ 동영상은 KBS에서 해
보면 좋을 것 같네요. 요즘 리얼플레이어 지원하는 데가 별로 없어서.. 도움이 되긴 할라나
 모르것네요.  I could not get the Realplayer to work as a plug in Mozilla and its relatives
but it does work as an application helper.
Realplayer does work as a plug in Netscape 4.79.  That is why I am keeping
Netscape 4.79 until Realplayer works on Mozilla and its relatives.
 I only got 80% of real player to work under Netscape 6.
If you know how to get 100% of real player to work, please tell me.
 Copy your plugins from Netscape 4.79 (i.e. /opt/netscape/plugins) into
Netscape 6 (/usr/local/netscape/plugins)
 I found that realplayer plugin does not work.
Here is how to configure to get 4/5 of realplayer to work:
 Netscape 6 does not ship with any predefined helper applications (i.e.,
mime types). You must manually
configure Netscape 6 to recognize RealMedia files (.ra, .rm, .rv, .ram,
.rpm).
 After you manually configure Netscape, RealPlayer will start and play the
file when you click a RealMedia
link on a web page.
 To manually configure Netscape 6 to recognize RealMedia files:
 1. Start Netscape 6.
2. Click the Edit menu and choose Preferences.
3. Select the "Helper Applications" category.
4. Click New Type.
 In the New Type dialog box, enter the following:
                               Description of type: RealPlayer File
                              File extension: .ra, .rm, .ram
                              MIME type: audio/x-pn-realaudio
 5. Click Choose and locate realplay (in my system,
/usr/local/RealPlayer8/realplay).
6. Click OK.
 Repeat steps 4-6 for each of the following file types:
                               Description of Type: RealAudio File
                              Extension:.ra, .ram
                              MIME Type: audio/vnd.rn-realaudio
                               Description of Type: RealVideo File
                              Extension:.rv
                              MIME Type: video/vnd.rn-realvideo
                               Description of Type: RealMedia File
                              Extension:.rm
                              MIME Type: application/vnd.rn-realmedia
                               THE FOLLOWING DOES NOT WORK!!!!
                              Description of Type: RealAudio File
                              Extension:.rpm
                              MIME Type: audio/x-pn-realaudio-plugin
 7. Close Netscape.
8. Start Netscape.
9. Click the Edit menu and choose Preferences.
10. Select the "Helper Applications" category.
11. Click "audio/x-pn-realaudio" in the File types window.
12. Click Edit.
13. Click to clear the "Ask me before opening downloaded files of this
type" check box.
14. Click OK.
 Repeat steps 11-14 for each of the file types below:
                               audio/vnd.rn-realaudio (RealAudio File)
                              video/vnd.rn-realvideo (RealVideo File)
                              application/vnd.rn-realmedia (RealMedia
File)
                              THE FOLLOWING DOES NOT WORK!!!
                              audio/x-pn-realaudio-plugin (RealAudio File)
  위에 보시면 rpm 파일은 작동하지 않는다고 되어 있는데요, 그거는 RealPlayer
넷스케이프용 플러그인을 설치하면 /usr/local/netscape/plugins 라는
디렉토리에(적확하지 않음. 찾아볼것) 리얼 플레이어 관련 파일 두개가 생깁니다.
그것을 모질라 플러그인디렉토리(/usr/lib/mozilla/plugins)에 복사해주거나
링크해주면 됩니다. 고로 .rpm 파일에 대해서는 헬퍼어플리케이션 지정이 불필요합니다.
윈도우에서 할 때는 확장자에서 . (점)을 빼고 하세요.
 --
http://my.netian.com/~innocens