Remove "sharing" from Excel workbook - powershell

Question

I'm trying to save a workbook to a new location with a password and keep the filename the same. The filname gets updated weekly with a date appended to it, so it's never the same. There are two things I'm having trouble with:
Using the SaveAs method to save the file with the same name in a different path &
I can't add a password because the workbook is shared.
I'm scripting this out in PowerShell, and if possible, I'd like to unshare the workbook in the script. Unfortunately, I can't seem to find a method that accomplishes this. Here is what I have so far... I really appreciate any advice.
$xls = new-object -com excel.application
$xls.Visible = $False
$xlsWB = $xls.Workbooks.Open("path\*.xlsx")
$xlsWB.Password = "Password"
$xlsWB.SaveAs("differentPath\*.xlsx")
$xls.Quit()
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($xls)
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($xlsWB)

Answer 1

Turns out, there is a method that can be called to change the sharing status of the workbook. It's ExclusiveAccess().
Here is my working code that solved the problem:
$xls = new-object -comObject excel.application
$xls.Visible = $False
$xls.DisplayAlerts = $False
$xlsWB = $xls.Workbooks.Open("FilePath")
$xlsWB.ExclusiveAccess()
$xlsWB.Password = "AddThisPassword"
$xlsWB.Save()
$xlsWB.Close()
$xls.Quit()
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($xls)
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($xlsWB)
move "CurrentPath" "NewPath"
Once I change the sharing status of the workbook, the Password method successfully adds a password to the workbook, solving the second issue described in the OP. Rather than use SaveAs(), I decided to simply move the file, which saves me from deleting the source file.
Thanks and I hope someone finds this useful.

Answer 2

this was my attempt at a similar problem. It removes the MultiUserEditing of files within a folder structure.
foreach ($file in (Get-ChildItem "C:\path_to_reports\" -File -Filter "*.xls" -recurse))
{
#The filter seems to also work for *.xlxsx
$Excel = New-Object -comobject Excel.Application
$Excel.Visible = $False
$Excel.DisplayAlerts = $False
$ExcelWorkbook = $Excel.workbooks.open($file.fullname)
If ($ExcelWorkbook.MultiUserEditing -eq "True")
{
$ExcelWorkbook.ExclusiveAccess()
$ExcelWorkbook.Save()
}
#close the workbook and not the file
$ExcelWorkbook.Close()
#Quit the file
$Excel.Quit()
#cleanup
[System.GC]::Collect()
[System.GC]::WaitForPendingFinalizers()
#more clean up
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($Excel)
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($ExcelWorkbook)
#the most clean up
Remove-Variable -Name excel
}