$signExe = 'C:\Program Files (x86)\Windows Kits\10\bin\10.0.15063.0\x86\signtool.exe'
$files = gci '..\Build\QuickLook-*.appx' | %{('"{0}"' -f $_.FullName)}
$timestampUrl = 'http://time.certum.pl/'

.$signExe sign /a /v /fd sha256 /t $timestampUrl $files