In PHPExcel/Shared/OLE/OLE_File.php function init
$this->_tmp_filename = tempnam($this->_tmp_dir, "OLE_PPS_File");
Join below
if($this->->_tmp_filename==false){
$this->->_tmp_filename="C:\WINDOWS\Temp\".time()."tmp";
}
Because
The tempnam function cannot generate temporary file names in Windows 2003
Excerpted from lpdx111’s column
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