Quake III Demo´s?

[AngryRabbit]

I have some new Quake III demos on my PC, but they are in the format of "DM_3" or something, and cant be read by Quake. The other Demos that I have that do work are in the format "D_68" (I think). I have already tried changing the file type of the one´s that dont work to "D_68". This makes them readable in the Quake menus, but gives me an error when I try to run them. <IMG SRC="images/forum/smilies/icon_mad.gif"> <IMG SRC="images/forum/smilies/icon_mad.gif">
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<BR>Cheers
<BR>AngryRabbit