Download the link below and check out the readme for how to workaround this problem.
The executable takes the url and Post Data from the bottom of Web Form Explorer and creates an xml formatted forvariables statement that can be run in a package.
- Note: I fixed an issue that caused bad results when POST statements contained
Frame:FrameName - 12/17/2007
http://www.velocityscape.com/Download/PostToFormVariables.zip