WCF file transfer problem, how to solve?

Question

C++ / C#

Good afternoon!
There is a WCF service for transferring files from the server to the client:
IOAuth.cs

[OperationContract(Name = "FileServerToClient")]
        byte[] FileServerToClient(string type);

OAuth.cs

public byte[] FileServerToClient(string type)
        {
            try
            {
                if (type == "Client")
                {
                    FileStream fs = new FileStream(@"E:\Обновление ГАС Управление\Update\GAS-ASU.exe", FileMode.Open);
                    buffer = new byte[fs.Length];
                    int len = (int)fs.Length;
                    fs.Read(buffer, 0, len);
                    fs.Close();
                }
                else
                {
                    if (type == "Config")
                    {
                        FileStream fs = new FileStream(@"E:\Обновление ГАС Управление\Update\GAS-ASU.exe.config", FileMode.Open);
                        buffer = new byte[fs.Length];
                        int len = (int)fs.Length;
                        fs.Read(buffer, 0, len);
                        fs.Close();
                    }
                }
            }
            catch (Exception ex)
            {
                log(ex.ToString(), "Функция  Update_file");
            }
            return buffer;
        }

Server config (ip addresses changed)

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>
  <system.serviceModel>
    <services>
      <service behaviorConfiguration="mexBehaviors" name="Сервер_авторизации.OAuth">
        <endpoint address="OAuth" binding="basicHttpBinding" contract="Сервер_авторизации.IOAuth" />
        <endpoint address="OAuth" binding="mexTcpBinding" contract="Сервер_авторизации.IOAuth" />
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="http://10.10.10.10:1020/" />
            <add baseAddress="net.tcp://10.10.10.10:1021/" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="mexBehaviors">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
          <serviceCredentials>
            <userNameAuthentication userNamePasswordValidationMode="Custom"
              customUserNamePasswordValidatorType="ServiceWithAuthentication.CustomUserNameValidator, ServiceWithAuthentication" />
          </serviceCredentials>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <bindings>
      <wsHttpBinding>
        <binding closeTimeout="00:10:00" openTimeout="00:10:00" receiveTimeout="00:10:00"
          sendTimeout="00:10:00" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647">
          <security>
            <transport clientCredentialType="None" />
            <message clientCredentialType="UserName" />
          </security>
        </binding>
      </wsHttpBinding>
    </bindings>
  </system.serviceModel>
</configuration>

and client (excerpt from client):

var client = new svc.OAuthClient("MetadataExchangeTcpBinding_IOAuth");
client.Open();
FileStream fss = new FileStream(Application.StartupPath + @"\GAS-ASU.exe", FileMode.Create, FileAccess.Write);
fss.Write(client.FileServerToClient("Client"), 0, client.FileServerToClient("Client").Length);
fss.Close();

Client config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_IOAuth" closeTimeout="00:05:00" openTimeout="00:05:00" maxBufferPoolSize="2147000000" maxBufferSize="2147000000" maxReceivedMessageSize="2147000000" />
      </basicHttpBinding>
      <netTcpBinding>
        <binding name="MetadataExchangeTcpBinding_IOAuth" openTimeout="00:05:00" sendTimeout="00:05:00" maxBufferPoolSize="2147000000" maxBufferSize="2147000000" maxReceivedMessageSize="2147000000">
          <security mode="None" />
        </binding>
      </netTcpBinding>
    </bindings>
    <client>
      <endpoint address="http://10.10.10.10:1020/OAuth" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IOAuth" contract="svc.IOAuth" name="BasicHttpBinding_IOAuth" />
      <endpoint address="net.tcp://10.10.10.10:1021/OAuth" binding="netTcpBinding" bindingConfiguration="MetadataExchangeTcpBinding_IOAuth" contract="svc.IOAuth" name="MetadataExchangeTcpBinding_IOAuth" />
    </client>
  </system.serviceModel>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
  </startup>
  <appSettings>
    <add key="departament" value="Lan" />
    <add key="ClientSettingsProvider.ServiceUri" value="" />
  </appSettings>
  <system.web>
    <membership defaultProvider="ClientAuthenticationMembershipProvider">
      <providers>
        <add name="ClientAuthenticationMembershipProvider" type="System.Web.ClientServices.Providers.ClientFormsAuthenticationMembershipProvider, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" serviceUri="" />
      </providers>
    </membership>
    <roleManager defaultProvider="ClientRoleProvider" enabled="true">
      <providers>
        <add name="ClientRoleProvider" type="System.Web.ClientServices.Providers.ClientRoleProvider, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" serviceUri="" cacheTimeout="86400" />
      </providers>
    </roleManager>
  </system.web>
</configuration>

Everything works with a bang on Windows 7, but as soon as it comes to Windows XP, then there's trouble ...
the GAS-ASU.exe and GAS-ASU.exe.config file is created in 0 Kb, what could be the reason and how to fix it?
I will not refuse another way to transfer files from the server to the client.
Thank you all in advance.

Answer 1

As far as I know, .NETFramework,Version=v4.5 and XP are not friends.