copy /b command size limit issue

Yes i can use something else and I will be glad to switch to that, but only if i knew something. if you know any alternative for doing the same action kindly share. :)

actually yes i have embedded this command into my c# application and that will be more appropriat if direct coding is done instead. first link seems to be helpful to me. I'll share my results after trying that. Thnkx, Regards and stay blessed :)

I tried this code :

private void button1_Click(object sender, EventArgs e)
{
// then use as follows (do in a loop, don't forget to use using-blocks)
Stream yourInputStream = new System.IO.FileStream("C:\\test\\zip.zip", FileMode.Open);
Stream yourOutputStream = new System.IO.FileStream("C:\\test\\test.mp4", FileMode.Append);

CopyStreamToStream(yourOutputStream, yourInputStream);

}


void CopyStreamToStream(Stream dest, Stream src)
{
int bytesRead;

// experiment with the best buffer size, often 65536 is very performant
byte[] buffer = new byte[999999];

// copy everything
while((bytesRead = src.Read(buffer, 0, buffer.Length)) > 0)
{
dest.Write(buffer, 0, bytesRead);
}
}


exactly doing the same work as copy /b command, but same issue is also here. if the output file is greater than 1 gb i cant open it using winrar to view the embedded file as i can view in the file less than 1 GB. I think, the problem is not with copy /b command or this code. because filesize increases exactly with proportion, so problem may be during opening files with winrar. Seems that i can embed file but cant extract it later :( Im stuck