Upload Report part to SQL Server Reporting Services programmatically (.RSC file extension)

 {
 SSRS.ReportingService2005 _rs = new ConsoleApplication2.SSRS.ReportingService2005();
 _rs.Url = "http://localhost/ReportServer/ReportService2005.asmx";
 _rs.Credentials = System.Net.CredentialCache.DefaultCredentials;

 FileStream fs = null;string ReportName = string.Empty;byte[] data = null;
 SSRS.DataSourceReference reff = null;
 fs = File.OpenRead(@"D:\Report_WIP.rsc");
 data = newbyte[fs.Length];
 fs.Read(data, 0, (int)fs.Length);
 _rs.CreateReport("TestName", "/MSS Report Parts folder", true, data, null);//_rs.CreateResource("TestName", "/MSS Report Parts folder", true, data, "application/rs", null);

 fs.Close();

 }

I tried also CreateResource but I can't find out the .rsc extension mime-type.

Thanks