How to convert .xlsb to .xlsx or .xls using PowerShell

No, you can only do that with Excel. But you can automate Excel with PowerShell, if that is what you are asking for.

However, that the file is XLSB certainly has good reasons, mainly because it is much smaller. Are you certain you want to save as XLSX or XLS?

BTW, the code to save as XLSX is

$file = 'C:\temp\EE\Example'

$xlApp = New-Object -Com Excel.Application
$xlApp.Visible = $false
$xlApp.Workbooks.Open($file + '.xlsb').SaveAs($file, [Microsoft.Office.Interop.Excel.xlFileFormat]::xlOpenXMLWorkbook))
$xlApp.Quit()

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Hi,
as Qlemo already mentioned, there is no OOTB way. You would have to utilize Excel COM to automate this like

# Global objects
$scriptPath = (Split-Path -Parent $MyInvocation.MyCommand.Path) 
 
#-----------------------------------------------------
# Helper function to release unmanaged COM objects 
function Release-Ref ($ref) { 
([System.Runtime.InteropServices.Marshal]::ReleaseComObject( 
[System.__ComObject]$ref) -gt 0) 
[System.GC]::Collect() 
[System.GC]::WaitForPendingFinalizers()  
} 
#----------------------------------------------------- 

# Base variables
$basePath="F:\EE\"
$importFile="TestExcelBinary.xlsb"
$exportFile="TestNonBinary.xlsx"
$xlFileFormat = "Microsoft.Office.Interop.Excel.XlFileFormat" -as [type]
 
# Needs to be set if Office Install is different than regional settings 
$newci = [System.Globalization.CultureInfo]"en-US"
[system.threading.Thread]::CurrentThread.CurrentCulture = $newci 

# Lets begin
$now = Get-Date
Write-Host "Started execution: $now"

# Initialize Excel COM
$objExcel = New-Object -ComObject Excel.Application
$objExcel.visible = $false
$wb = Get-Item("$basePath$importFile")
$workbook = $objExcel.workbooks.open($wb.fullname, 3)

# Close the workbook - not saving changes (print areas)
$workbook.SaveAs("$basePath$exportFile",$xlFileFormat::xlOpenXMLWorkbook)
$objExcel.Workbooks.close()
$objExcel.Quit()

# Now cleanup COM objects
$a = Release-Ref($workbook) 
$a = Release-Ref($objExcel)

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HTH
Rainer

Sorry now the requirement has changed we have .xlsb file with three tabs and we want to convert to .csv format.
Example: if i have .xlsb file say Test.xlsb with three sheets called sheet1,sheet2 and sheet3 and we would like to convert to Test_sheet1.csv,Test_sheet2.csv and Test_sheet3.csv. Is it possible?

Thanks a lot it works perfectly