mp4, aac, etc. and DME

Hi,

I hope someone can help me with this problem.  I have Dell Media Experience installed and would love to use it for my .mp4 collection.  I have already installed the necessary codec to play these files in Windows Media Player and have even added all these files to my Media Player Library under the heading other media types.  So, my question is, why can Windows Media Player find these files now but not Dell Media Experience?  Is there a way to change a registry setting etc. that will make Dell Media Experience search for these files as well?  Even if this were possible, would Dell Media Experience even be able to play these files?  Any help would be greatly appreciated.