1, open the file prompt "extension file corruption error ..."
Online search options:
Scheme 1, Excel open repair
scheme 2, modify Excel Trust Center options - Protected View (personal use this to solve the problem)
scheme 3, Advanced Excel Repair Administration for repair
scheme 4, WPS open before exporting to Ecel
Scheme 5, using repair tool ExcelRecovery
2, the cell loss crosshairs
File - Options - Advanced - enabled cell handle and filled with drag and drop