"Illegal characters in path" error opening service config file

I am trying to read a section of a Windows service configuration file and extract a value (port number). Following code works fine on my local machine but not in any server I tested even though the service is installed in exact same folder structure.

On servers, I get "illegal character in path" error (I added a couple of try-catch to see where it dies and what the message was).

public static string GetCurrentTCPPort(){    string sTCPPort = "7899";    string ServiceName = "ABC - Tcp Interface Service";    using (ManagementObject wmiService = new ManagementObject("Win32_Service.Name='" + ServiceName +"'"))    {        try        {            wmiService.Get();        }        catch (Exception ex)        {            throw new Exception("Died in GetCurrentTCPPort - wmiService.Get()");        }        string ServiceExePath = wmiService["PathName"].ToString();        System.Configuration.Configuration config;        try        {            config = ConfigurationManager.OpenExeConfiguration(ServiceExePath); // FilePath = "C:\\ABC\\APP\\ABC - Tcp Interface Service\\ABC.Service.TcpInterface.exe.config"            string[] saLiteningIPs = config.AppSettings.Settings["TcpServerListenIpAddrsAndPortNos"].Value.Split(',');    // "1.2.3.4:7899,1.2.3.5:7899"            if (saLiteningIPs.Length > 0)            {                sTCPPort = saLiteningIPs[0].Split(':')[1];            }        }        catch (Exception ex)        {  // This exception is thrown            string sExcep = string.Format("Died in GetCurrentTCPPort - OpenExeConfiguration(); ServiceExePath: {0}{1}Exception: {2}", ServiceExePath, Environment.NewLine, ex.Message);            throw new Exception(sExcep);        }    }    return sTCPPort;  }

When I run it, I get:

Died in GetCurrentTCPPort - OpenExeConfiguration(); currentserviceExePath: "C:\ABC\APP\ABC - Tcp Interface Service\ABC.Service.TcpInterface.exe"Exception: An error occurred loading a configuration file: Illegal characters in path.