Help needed using a PowerScript Tutorial please

Question

Hi
I'm just following this tutorial PowerShell check folder for modified files in the last X minutes which crashes when I get to line 5 :-
$xminutes="60"
$xPath="c:\temp\*.*"
$xfile = Get-ChildItem -Path $xPath -Filter *.txt, *.xml | ? {
$_.LastWriteTime -gt (Get-Date).AddMinutes(-$xminutes) }
Write-Host $xfile
The error is :-
Get-ChildItem : Cannot convert 'System.Object[]' to the type 'System.String' required by parameter 'Filter'.
Specified method is not supported.
At line:5 char:46
+  $xfile = Get-ChildItem -Path $xPath -Filter *.txt, *.xml | ? {
+                                             
~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Get-ChildItem], ParameterBindingException
    + FullyQualifiedErrorId : CannotConvertArgument,Microsoft.PowerShell.Commands.GetChildItemCommand
I'm very new to Powerscript(v4 installed) and I get confused where the pipe and question mark appear. Can anyone help to correct this line for me please.
Kind Regards
Matthew

Answer 1

Issue is already fixed, thats fine.
Additional info:
(1) With  $xminutes="60"
you define a string, not number.  AddMinutes() requires a number (a double value).
Powershell automatically converts your string into a number before handing it over to AddMinutes.
It is better to write
$xminutes=60
(2) The  ?  is a short alias for 
Where-Object
. I avoid "?" and use the "longer" alias  Where 
instead: It still is shorter than "where-object" but it is clear and easier to read.
The same with "%":
%=foreach=ForEach-Object
I'm used to avoid  % , I prefer
foreach.
Walter