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I thik i've find a solition :D

I'm not a programmer, but i supposed that the error of the
mkdir command was the necessity of the "recursive" option of

than i've checked php.net for recursive mkdir fuctions and
i've find some examples lines to make a recursive directory,
i've changed the $working_directory and tested....IT WORK :D

$working_directory = $GO_CONFIG->file_storage_path.'forum/'.$id;
do {
$dir = $working_directory;
while (!@mkdir($dir,0777)) {
$dir = dirname($dir);
if ($dir == '/' || is_dir($dir))
} while ($dir != $working_directory);

I dont know if this is a correct patch, but the new forum
creation make the correct dir structure and now the attach
file work :D