ASP.NET Web Api 2 - Internet Explorer: The process

I have a Restful ASP.NET Web API 2 with the following method that returns a HttpResponseMessage with an image as content:

[AllowAnonymous]
[HttpGet, Route("{id}/image/"]
    public HttpResponseMessage GetImage(int id)
    {
        try
        {
            var artwork = Service.GetSingle(id);

            if(!isValidArtwork(artwork)) {
                 Request.CreateResponse(HttpStatusCode.NotFound); 
            }

            string mediaHeaderValue;
            switch (Path.GetExtension(artwork.filePath))
            {
                case ".jpg":
                    mediaHeaderValue = "image/jpg";
                    break;
                case ".jpeg":
                    mediaHeaderValue = "image/jpg";
                    break;
                case ".bmp":
                    mediaHeaderValue = "image/jpg";
                    break;
                case ".png":
                    mediaHeaderValue = "image/png";
                    break;
                default:
                    return new HttpResponseMessage(HttpStatusCode.NotFound);
            }

            using(var fileStream = File.Open(artwork.filePath, FileMode.Open, FileAccess.Read)){

                var response = new HttpResponseMessage { Content = new StreamContent(fileStream) };
                response.Content.Headers.ContentType = new MediaTypeHeaderValue(mediaHeaderValue);
                response.Content.Headers.ContentLength = fileStream.Length;

                return response;
            }
        }
        catch (Exception){
            return Request.CreateResponse(HttpStatusCode.NotFound);
        }
    }

The method is working as intended in Chrome/Opera/Mozilla but in Internet Explorer (version 10/11), the following error is thrown: "The process cannot access the file because it is being used by another process".

I've tried different ways of closing/disposing the stream, using different file access attributes and setting the content as a byte array. However, the same error appears when using Internet Explorer (version 10/11).

Any suggestions on how this can be resolved? Or had similar problems with Internet Explorer (version 10/11)?

It is weird that this behaviour only triggers when the request is made from Internet Explorer. However, I've managed to find a solution. I was missing the FileShare.Read attribute when opening the file.

var fileStream = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

I've found another solution too. Copying the image data to a byte array, and disposing the file stream. Then use the byte array as content of the response message.

If anyone know, please let me know why this only happens in IE.