I managed to solve the problem thanks to Andreas' suggestion to use Smalltalk listLoadedModules to check what is being loaded.
The solution was to put the plugins in the image directory instead of the VM directory! This is funny, 'cause on Mac I always put them in the app directory. 

Rudi

olmeca at netscape.net (Rudi Angela) wrote:

>I'm trying to play MP3 sound files with Squeak on Windows, but with no success. I keep getting a #primitiveFailed when MPEGFile's #primFileValidMPEG: method is called.
>I'm using a 3.2 gamma 4811 image with a 3.1 VM and I have the Mpeg3Plugin.dll file in the VM directory.
>Does anyone have an idea what's going wrong?
>
>Thx,
>Rudi Angela
>
>
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