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The A2J Guided Interview 4.0 has to be in UTF-8 to upload properly to A2J Author 5.0.
Here is how to convert your files that won't upload to a format that will upload.
1. Download and open EditPadlite http://www.editpadlite.com/download.html (free text editor)
2. Open your 4.0 Guided Interview in the editor.