file hash differ from Powershell output

[bezik46]

echo 'number' > c:\windows\temp\file.txt
echo 'string' >> c:\windows\temp\file.txt
Get-FileHash c:\windows\temp\file.txt

Powershell hash is different than HashCalc
They should be identical

edit:
They are identical if I hash both ways ie c:\windows\notepad.exe

Seb