Devices we worked with for a project (thankfully not on GCP) are welded shut once built. They are designed to run for years on an internal battery then need to be recycled. They would all be paperweights in this scenario!
Install-Module ImportExcel
Then: ls *.xlsx -r | %{ Import-excel $_ } | ? { $_.Name -eq "Miller" } | sort
That's my naive, Powershell noob approach anyway. $excel = New-Object -com excel.application
And you can now open XLS/XLSX files and operate on them as an actual excel document (including iterating through workbooks/ worksheets, etc.). It's all just objects.