PowerShell Command not working

I have a powershell command that removes lines from a large text file to make it a more manageable size. When I try to run it in MATLAB it gives an error

!powershell Get-Content oldfile.txt | Where {($_.ReadCount % 1000) -eq 0}|Set-Content newfile.txt
'Set-Content' is not recognized as an internal or external command, 
operable program or batch file.

Any ideas how I can fix this?

[Venkata Siva Krishna Madala]

As posted by Kojiro Saito you have to put the command between double quotes.

!powershell "Get-Content oldfile.txt | Where {($_.ReadCount % 1000) -eq 0} | Set-Content newfile.txt"