2301027 - Warning message when opening Ad Hoc XLS Export File stating the format and extension of Report don't match

For any report in any instance try to export to excel (xls) and the pop up appears. If you click on open the following message is shown:
The file format and extension of 'report_XYZ_...........xls' don't match. The file could be corrupted or unsafe. Unless you trust its source, don't open it. Do you want to open it anyway?

SAP SuccessFactors HCM Core

excel export error, error opening excel , KBA , LOD-SF-ANA-ADH , Adhoc Reports & Report Builder , Problem