Are you trying to Launch them from LW? If you are, then instead go to the Shared folder located at C:/Program Files/LimeWire/Shared and try playing them from there.
If they still won't play (I think they will), then try another player.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-