Well if your having trouble opening Efhtys patch then the tools you need are ffviewer and pcfreaks patch converter. Here are links to both of these tools.
ffviewer:
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pcfreak30s patch converter:
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If you are trying to edit the patch you need to get an older patch, copy everything from efthys patch into the older patch and edit it. MAKE SURE TO HAVE A COPY OF THE EDITED PATCH ON THE XBOX VERSION. JUST IN CASE SOMTHING GOES WRONG WHEN CONVERTING.