i want to set the zoom size in the excel to 75% programmatic before it gets downloaded. The default value is set to 100% by default. Can any one help me out to solve this?

I use the below code to get the data from reports and store it in a byte array 

```
 bytes = rptViewer.ServerReport.Render("EXCELOPENXML", deviceInfo,
                    out mimeType, out encoding, out extensions, out streamids, out warnings);

```

Then passing the information to the below method to download the file in excel 

```
private HttpResponseMessage DownloadFile(string mimeType, byte[] bytes, string rptName, string extensions)
    {
        string fileName = rptName + "." + extensions;
        HttpRequestMessage msg = new HttpRequestMessage();
        if (!string.IsNullOrEmpty(fileName))
        {
            HttpResponseMessage response = new HttpResponseMessage();
            response.Content = new ByteArrayContent(bytes);
            response.Content.Headers.Add("x-filename", fileName);
            response.Content.Headers.ContentType = new MediaTypeHeaderValue(mimeType);
            response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
            response.Content.Headers.ContentDisposition.FileName = fileName;
            response.StatusCode = HttpStatusCode.OK;
            return response;
        }
        return msg.CreateResponse(HttpStatusCode.NotFound, "File not found.");
    }

```

so when it get download, it is set to be 100% by default. i want to it to be 75% by default.