Google Apis V2 html mime/type

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HTML

google-api

I upload doc,xls files but i dont understand how upload html files. This code upload file but dont preview file. Its say- "We apologize Preview not available". Whats mime type i must set ?

 if (extension == ".htm" || extension == ".html")
                    {

File body = new File();
body.Title = Path.GetFileNameWithoutExtension(item); 
//body.Description = "A test document";
body.MimeType = "text/HTML";
byte[] byteArray = System.IO.File.ReadAllBytes(item);
System.IO.MemoryStream stream = new System.IO.MemoryStream(byteArray);
FilesResource.InsertMediaUpload request = service.Files.Insert(body, stream,
"application/vnd.google-apps.file");
                        request.Convert = true;