qihuajun

Encountered same problem: ``` PHP Fatal error: Uncaught exception 'Exception' with message 'Feature not implemented (l.811 : fcc' in /vagrant/pdf/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint97.php:811 Stack trace: #0 /vagrant/pdf/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint97.php(618): PhpOffice\PhpPresentation\Reader\PowerPoint97->readRecordDocumentContainer('\x0F\x00\xE8\x03\xB1\x1C\x00\x00\x01\x00\xE9\x03(\x00\x00...', 8) #1 /vagrant/pdf/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint97.php(439): PhpOffice\PhpPresentation\Reader\PowerPoint97->loadPowerpointDocumentStream() #2...