I checked Amazon.fr and they state the character encoding as ISO 8859-1 and as this is programme is for Microsoft Windows only, your OS should support it at least as the modified Windows-1252 character set. I can't check for you but specifying the character set as such might help as I use UTF-8 for a script I wrote and it works with just about every character there is. Try adding the following (with and without the trailing -1) to your list of initial definitions in the .src file.
[Encoding]=url-iso-8859-1
Post back if it works or not and someone with Windows might be able to test it for you. Good luck!