New Post: Problem setCellValueExplicit with PHPExcel_Cell_DataType::TYPE_STRING

Hello,

I've tried to use the Testfiles like 01simple-download-xlsx there is the same problem
that the file can't open -> directly or after saving.

The error message fileformat or file extension not valid or corrupt/damaged.

Also I've tried to search the error with the text editior but without success.

I've windows 8
PHP Version 5.4.4

I hope you can help me