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OK. I analyzed code xoopseditor deeper. This directory is to upload the configuration files, not from this directory (what it was like in the old FCKeditor).
But it not work. There are some bugs in /xoopseditor/ckeditor/ckeditor.php:
First. Path to '/xoopseditor/ckeditor/module' is invalid.
Second. Argument for file_exists has to be PATH not URL.
Lines 63-64 should look like
if ( file_exists( XOOPS_ROOT_PATH . $this->rootPath . '/module/config.'.$dirname.'.js' ) )
$GLOBALS['xoTheme']->addScript( XOOPS_URL . $this->rootPath . '/module/config.'.$dirname.'.js' );
and lines 80-81
if ( file_exists( XOOPS_ROOT_PATH . $this->rootPath . '/module/config.'.$dirname.'.js' ) )
$ret .= '<script src="' . XOOPS_URL . $this->rootPath . '/module/config.'.$dirname.'.js' . '" type="text/javascript"></script>';
EDIT: I add this to BugTracker.
