This will work with Powershell, but it would be nice if it was built into the action.
$excel = New-Object -ComObject Excel.Application
$excel.Visible = $false
$workbook = $excel.Workbooks.Open("file.xlsx")
$binding = "System.Reflection.BindingFlags" -as [type]
Foreach($property in $workbook.BuiltInDocumentProperties){
if ([System.__ComObject].invokemember("name",$binding::GetProperty,$null,$property,$null) -eq "Last author"){
[System.__ComObject].invokemember("value",$binding::GetProperty,$null,$property,$null)
}
}
$excel.quit()