chgport Command not Recognized when Running from a Process to Capture Output

Question

I am trying to determine what serial ports are available using VB.NET. When I run a batch file from the command line, it works fine. When I try to run it and capture the output, the chgport command is not recognized as shown below

I tried changing UseShellExecute to False, but it says it needs to the true to capture the output.

I tried being very specific with the paths, even using a command shell to run the chgport command. None of that made any difference.

Any thoughts on what is causing the difference between running from the command line and running in a process to capture the output?

The code snippet I'm using to capture the output:

    ' Fill in the com ports and file versions
    Dim oProcess As New Process()
    Dim oStartInfo As New ProcessStartInfo("c:\xpp_prog\ports_and_files.bat", "")
    oStartInfo.UseShellExecute = False
    oStartInfo.RedirectStandardOutput = True
    oStartInfo.RedirectStandardError = True
    oProcess.StartInfo = oStartInfo
    oProcess.Start()

    Dim sOutputS As String
    Using oStreamReader As System.IO.StreamReader = oProcess.StandardOutput
        sOutputS = oStreamReader.ReadToEnd()
    End Using

    Dim sOutputE As String
    Using oStreamReader As System.IO.StreamReader = oProcess.StandardError
        sOutputE = oStreamReader.ReadToEnd()
    End Using

    MsgBox(sOutputS + sOutputE)

Here is the batch file:

@echo off
cmd /c C:\Windows\System32\chgport.exe
dir c:\xpp_prog\build_*