Commented Unassigned: Broken XLSX [13792]

Hi, I have several problematic XLSX files. When I try to open and save them result file is broken and can not be opened by excel.
Can you tell me what is wrong with the files ?

Thanks
Comments: ** Comment from web user: Hellissimo **

I think it is the same issue like this:

__"corrupt XLSX file after reference (formula) to a CellValue, which contains a '&' sign"__

[TEXT](https://npoi.codeplex.com/workitem/13893)

at the moment, I am searching for a solution.