Problem uploading PDF Files

[eluser]LTFMIKE[/eluser]
Hi Everybody. I would like also to share my problem here.I tried to Upload file using uploading class and it's works quite fine.Unfortunately, if I upload file with particular filename like for exemple "1_file_rue_hôpital.pdf"
it will be set correctly in database like : "1_file_rue_hôpital.pdf" but
filename of the file itself is not correctly saved on the server.I obtain file like :
"rue_hôpital.pdf"

I search many topic to find a solution but I haven't found something helpful yet.

Hope you guys help me..;

here is my upload controller configuration :

Code:

$filePath=$this->createArboGen($arbo);
        $config['upload_path']         = $filePath;
        $config['allowed_types']     = 'pdf|xls|doc';
        $config['max_width']          = '1024';
        $config['max_height']          = '768';
        $config['overwrite']        = 'TRUE';
        $config['remove_spaces']    = 'TRUE';
        $data['erreur']                = $this->erreur;        
        
        $this->setFile($dataFile,'',$fileTypeId);
        $this->insertFile();
        $config['file_name']        = $this->file_id ."_";