SYMPTOM:
After a report is exported to Excel without formatting, the sheet name found as a number like YYYYMMDDHHMMSS.exp instead of the actual report name in Strategy Web 9.0.x as explained in the following Technical Note:
KB19099 - When exporting a report to Microsoft Excel, the report name is not generated correctly in Strategy Web 8.1.x
However, after the suggested action taken, the name in the tab now starts with ".xls]"
STEPS TO REPRODUCE:
Execute the following in Strategy Tutorial:

CAUSE:
This is a known issue with Strategy Web 9.0.x and 9.2.x.
ACTION:
Contact Strategy Technical Support for an update regarding this issue.