The file baby3dfx.dll is part of a plugin for WinAmp that produces a 3D dancing baby. WinAmp is an audio program that includes levels of customization to its users. This particular plugin was created by an unknown user to draw a 3D baby that dances along to your music as you play it.
An error with this file may mean that the plugin was installed incorrectly, or that the file has been moved since its installation. To get the baby to dance, you will need to fix the error by either moving the file to the correct spot on your computer or by editing the registry to have it point to the spot the file is currently located.
Editing the registry is not recommended for the average computer user. Small mistakes while editing can completely disable your computer. Instead, use ZookaWare PC Cleaner to scan and clean your registry and fix the pesky errors, and get that baby back to dancing.