How to export Windows driver HLK test results into Excel or HTML?

Do you know how to export Windows driver HLK test results into Excel or HTML? I use HLK Studio, HLK Manager.
In documentation there is one approach stating:

dir -s "c:\temp*.xml" | Merge-HwCertTestCollectionFromXml -ValidationXmlPath "C:\temp\master.xml" | Export-HwCertTestCollectionToXml -Output "C:\Temp\merged_1.xml" -TestPassIdentifier “TP003”

New-HwCertTestCollectionExcelReport ("C:\Temp\merged_1.xml", "C:\Temp\merged_2.xml" ) -ExcelPath 'c:\temp\report.xls' -ResultCount 1

But where are relevent xml files stored (on my system they are not in c:\temp)?
When I manually search for relevant XML files I get "error on parsing line 1" or similar results meaning that those were not correct files.