Powershell Worksheet.saveAs saving wrong Sheet - excel

Question

I am trying to save a specific Excel Sheet from a Macro Enabled Excel Workbook (xlsm) via Powershell to csv to upload it into a database. This is done via Powershell since it needs to be automated along with some more data processing etc.
The Situation:
I have a list of excel files in a directory, each having the same structure/sheets.
I parse each file to a Powershell function which creates a new Excel Object and opens the workbook.
In the next step I am trying to save a specific sheet (here Sheet with Index 2)
The Problem:
Iterating through each Worksheet and saving them gives me all Sheets including the one I am looking for (Sheet 2)
Accessing Sheets 2 via $ws = $wb.Worksheets(2) also gives me the right Sheet (according $ws.name) but saving $ws via $ws.SaveAs("$destinationDirectory" + $File.BaseName + ".csv", 6) results in a csv file containing Sheet 1.
I have saved Worksheets with basically exactly the same code successfully before (except instead of xlsm I was dealing with xlsx).
Code
Function ExcelToCsv ($File) {
echo "Converting $($File.Name) to csv..."
$Excel = New-Object -ComObject Excel.Application;
$Excel.DisplayAlerts = $False;
$wb = $Excel.Workbooks.Open($File)
$ws = $wb.Worksheets(2)
echo "ws is:" + $ws.name # Correctly printing Worksheet name of Sheet 1
$ws.SaveAs("$destinationDirectory" + $File.BaseName + ".csv", 6) # Saving Sheet 1 instead of Sheet 2
$wb.Close($True);
}
}
foreach ($file in $files){
ExcelToCsv -File $file;
}
Workaround
My current workaround is to iterate through the sheets via foreach
$n = 1
foreach($ws in $wb.Worksheets){
$ws.SaveAs("$destinationDirectory" + $File.BaseName + "-$($n).csv", 6)
$n = $n+1
}
And deleting any unwanted sheets (recognized by $n != 2) via
Remove-Item "$($destinationDirectory)*-[13456789].csv";
Which works but is not really optimal.
Also: checking for $n -eq 2 in the foreach and only saving that sheet also does not work since it will simply save sheet 1 again.
And ideas are greatly appreciated!

Answer 1

After a frustrating afternoon I eventually worked this one out - you need to call Activate against the sheet you want to save e.g.
$sheet = $book.sheets.item('User_Specified_Report')
$Sheet.Activate()
$sheet.SaveAs($newName,6)