Paolo,

 

Can you explain how you added the *.RM file?

 

The insert media dialog will insert the following code:

 

<object codebase="http://activex.microsoft.com/activex/ controls/mplayer/en/nsmp2inf.cab#Version=6,0,02,902" type="application/x-oleobject" height="200" standby="Loading Microsoft Windows Media Player components..." width="240" classid="CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95">
<param name="FileName" value="/uploads/donut.mpg"   /><param name="autoStart" value="1"   /><param name="showControls" value="1"   /><embed name="MediaPlayer1" src="http://cutesoft.net/uploads/donut.mpg" autostart="1" showcontrols="1" width="240" height="200" type="application/x-mplayer2" pluginspage="http://www.microsoft.com/Windows/MediaPlayer"   ></embed>
</object>

 

It will not work for *.RM file.

 

Please check the following article for embedding RM file:

 

How to Embedding RealMedia Files