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The ProcessStartInfo.WorkingDirectory property must be set if ProcessStartInfo.UserName and ProcessStartInfo.Password are provided. If the property is not set, the default working directory is %SYSTEMROOT%\system32.
If the ProcessStartInfo.UserName property is not null or an empty string, the ProcessStartInfo.UseShellExecute property must be false, or an InvalidOperationException will be thrown when the Process.Start(ProcessStartInfo) method is called.