So you can get back the Win8.1 preview experience index

Speaking of "Windows Experience Index", it comes from Windows Vista (1 - 5.9), Windows 7 (1 - 7.9), Windows 8 (1 - 9.9), but it seems to stop at Windows 8.1, at least The Win8.1 preview is hidden.
When Windows RT was officially launched in October last year, the Windows Experience Index feature was removed; only Win8 kept it and raised the highest rating to 9.9. Now, although the Windows Experience Index is not visible in the Win8.1 preview, Microsoft has not completely removed it. The Windows system evaluation tool WinSAT.exe is still located in the Win8.1 preview version of the "C:WindowsPerformance" folder.
Now, talk about how to retrieve the Windows Experience Index in the Win8.1 preview:
First, run winsat -help as an administrator to view the command line usage related to the Windows system evaluation tool.

Second, run winsat formal as an administrator and start the Windows system evaluation tool.

3: The data generated by running the Windows System Assessment Tool is located at: C:WindowsPerformanceWinSATDataStore

4, to "%SystemRoot%explorer.exe /E,::{ED228FDF-9EA8-4870 -83b1-96b02CFE0D52} ” Create shortcuts for objects (without quotes):

5. Double-click to view the experience index of Win8.1 preview: