The plugin that ships with Cincom Smalltalk, Winter edition (VW 7.4) has some problems - and we have the patch. Navigate here, and you can grab the zip file. Here's the sescription of the problem:

AR50145: VW Internet Explorer Plugin broken in 7.4

Problem:

   Starting any of the plugin demos and examples raises an exception MNU: #urlDecode

Fix:

The ar50145.zip download contains a complete replacement for the VisualWorks \plugin directory. The Plugin parcel, as well as the distribution units for deployment, and the example html pages have all changed. The ActiveX Control DLL has not changed.

Changed:

Installation:

To update the plugin test samples, simply open the \plugin\examples\index.html and select one of the samples to run. This will update the VisualWorks plugin installation on your machine.

If you have deployed a VisualWorks Plugin application, please consult the \plugin\deploy\readme.txt for instructions to rebuild and redeploy your application. You will need a new plugin image (containing the new Plugin parcel) and new CAB deployment files. It is also critical that the OBJECT tags in your HTML pages be changed to reference vwpluginax.cab#version=-1,-1,-1,-1 so that Internet Explorer will download and install your new CAB files. If you explicitly reference the version of the VisualWorks Plugin ActiveX Control (which did not change) IE will not install the new VisualWorks components.