Disallowed Characters Problem in downloading File

[eluser]jhayghost[/eluser]
Hello,

I downloaded a class for downloading files it is working fine in my local copy but when I uploaded live I found out that it will download a file w/ a content "disallowed characters".

CLASS File

Code:

<?php
class Download
{
    var $ContentType;                
    var $ContentLength;
    var $ContentDisposition;
    var $ContentTransferEncoding;
    var $Path;
    var $FileName;
    var $FileNameDown;
    /**
    * Constructor
    * @access        public    
    */    
    function Download()
    {
        $this->ContentType         = "application/save";
        $this->ContentLength        = "";    
        $this->ContentDisposition    = "";
        $this->ContentTransferEncoding    = "";
        $this->Path            = "";
        $this->FileName            = "";
        $this->FileNameDown        = "";        
    }
    /**
    * It configures value Header 'ContentType'
    *
    * @access public
    */        
    function setContentType($strValue)
    {
        $this->ContentType = $strValue;
    }
    /**
    * It configures value Header 'ContentLength' with the size of the informed file
    * @return        void
    * @access        private
    */    
    function _setContentLength()
    {
        $this->ContentLength = filesize($this->Path . "/" . $this->FileName);
    }
    /**
    * It configures value Header 'ContentDisposition'
    * @access        public
    */    
    function setContentDisposition($strValue)
    {
        $this->ContentDisposition = $strValue;
    }
    /**
    * It configures value Header 'ContentTransferEncoding'
    * @access        public
    */    
    function setContentTransferEncoding($strValue)
    {
        $this->ContentTransferEncoding = $strValue;
    }
    /**
    * It configures the physical place where the file if finds in the server
    * @access        public
    */    
    function setPath($strValue)
    {
        $this->Path = $strValue;
    }
    /**
    * Init Download
    * @access        public
    */    
    function send($strValue, $renameValue ="")
    {
        if(empty($strValue))
        return FALSE;
        $this->FileName = $strValue;
        $this->FileNameDown = $renameValue;
        $this->_setContentLength();
        header("Content-Type: " .  $this->ContentType);    
        header("Content-Length: " .  $this->ContentLength);
        if ($this->FileNameDown == "")
            header("Content-Disposition: attachment; filename=" . $this->FileName);
        else
        header("Content-Disposition: attachment; filename=" . $this->FileNameDown);
        header("Content-Transfer-Encoding: binary");
        $fp = fopen($this->Path . "/" . $this->FileName, "r");
        fpassthru($fp);
        fclose($fp);        
    }        
}

?>

Controller

Code:

<?php
class Files extends Controller {
    function Files()
    {
        parent::Controller();
    }
    function index()
    {
        $this->load->library('download');
        $this->download->setPath("path");
        $this->download->send("filename.ext");
    }
}

Thanks in advance.

[eluser]jhayghost[/eluser]
I also tried the force_download but the same error I got in live site but in my local copy it is working fine.