PowerShell function to convert Excel .xlsb files to .csv

ConvertFrom-XLSB.ps1

## 
# Convert .xlsb to .csv - PowerShell function. 
##
## USAGE:
# Open Windows PowerShell, change your paths on below one liner and paste it in Windows PowerShell:
# Set-ExecutionPolicy Bypass -Scope Process -Force; $username = $env:username; . "C:\Users\$username\Documents\ConvertFrom-XLSB.ps1"; Get-ChildItem "C:\Users\$username\Desktop\*xlsb' | Sort-Object LastWriteTime -Descending | Select-Object -First 1 -ExpandProperty Fullname | ConvertFrom-XLSB -OutputPath 'C:\Users\$username\Desktop\'
##

function ConvertFrom-XLSB {
    param(    
        [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
        [Alias('filename','file','fullname')]
        [string] $Path,

        [Parameter(Mandatory=$false, ValueFromPipeline=$false)]
        [string] $OutputPath=((Get-Location).Path)
    )

    Add-Type -AssemblyName Microsoft.Office.Interop.Excel
    $xlFixedFormat = [Microsoft.Office.Interop.Excel.XlFileFormat]::xlCSV
    $excel = new-object -ComObject "Excel.Application"
    $excel.DisplayAlerts = $false
    $excel.Visible = $false

    $Workbook = $excel.Workbooks.Open($Path) 


    foreach($Worksheet in $Workbook.Worksheets) {
        # Filename:
        $Filename = [system.io.path]::combine($OutputPath,[string]::concat($Worksheet.Name,'.csv'))
        Write-Verbose "Output filename: $Filename"

        # Delete file if exists:
        if (Test-Path -Path $Filename) { Remove-item -Path $Filename -ErrorAction Stop }

        # Save file as CSV:
        $Worksheet.SaveAs($Filename, $xlFixedFormat) | Out-Null
    }
 
    $Workbook.close($False) 
     
    $excel.Quit()
    [void][System.Runtime.Interopservices.Marshal]::ReleaseComObject($excel) 
}