Inquisitorial question: What does open return? Normally this should be the PID of the subprocess in this case – if you had success. By the way, I think you need this (because there is no tail under Windows):

Get-Content
   [-ReadCount <Int64>]
   [-TotalCount <Int64>]
   [-Tail <Int32>]
   [-Path] <String[]>
   [-Filter <String>]
   [-Include <String[]>]
   [-Exclude <String[]>]
   [-Force]
   [-Credential <PSCredential>]
   [-Delimiter <String>]
   [-Wait]
   [-Raw]
   [-Encoding <Encoding>]
   [-AsByteStream]
   [-Stream <String>]
   [<CommonParameters>]
[download]

Regards, Karl