ProcessStartInfo fails to start Office apps with other system user


Trying to launch Office apps with other user on the system is not working, it is throwing this exception:

System.ComponentModel.Win32Exception (0x80004005): A specified logon session does not exist. It may already have been terminated
at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)
at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)

It is working properly for other win32 apps like Notepad, etc..

This is the code snippet:

using System.Diagnostics;
using System.Security;

class Program
static void Main(string[] args)
    var processPath = @"C:\Program Files\Microsoft Office\root\Office16\EXCEL.EXE"; // Path to a local office app
    ProcessStartInfo ps = new ProcessStartInfo(processPath)
        UserName = "otherUserInTheSystemName",
        Domain = Environment.MachineName,
        Password = StringToSecureString("password"),
        LoadUserProfile = true,
        UseShellExecute = false,
        WorkingDirectory = @"C:\users\otherUserInTheSystemName"

private static SecureString StringToSecureString(string value)
    var password = new SecureString();
    foreach (char c in value)
    return password;

Tested under Windows 10 2004 (OS Build 19041.508)

asked on Stack Overflow Sep 16, 2020 by Juanma Lopez • edited Sep 17, 2020 by Juanma Lopez

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