Should be:
RichEdit.Setting["security:ImageGalleryPath"] = filesPath + "Images/";
RichEdit.Setting["security:FilesGalleryPath"] = filesPath + "Files/";
RichEdit.Setting["security:MediaGalleryPath"] = filesPath + "Media/";
RichEdit.Setting["security:FlashGalleryPath"] = filesPath + "Flash/";
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