How to load Word document from byte array

Application app = new Application();

byte[] wordContent = GetBytesInSomeWay();

var tmpFile = Path.GetTempFileName();
var tmpFileStream = File.OpenWrite(tmpFile);
tmpFileStream.Write(wordContent, 0, wordContent.Length);
tmpFileStream.Close();

app.Documents.Open(tmpFile);

using (MemoryStream mem = new MemoryStream())
{
    mem.Write(documentByteArray, 0, (int)documentByteArray.Length);
    using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(document, true))
    {
        string docText = null;
        using (StreamReader sr = new StreamReader(wordDoc.MainDocumentPart.GetStream()))
        {
            docText = sr.ReadToEnd();
        }

        Regex regexText = new Regex("Hello world!");
        docText = regexText.Replace(docText, "Hi Everyone!");

        using (StreamWriter sw = new StreamWriter(wordDoc.MainDocumentPart.GetStream(FileMode.Create)))
        {
            sw.Write(docText);
        }
    }
}

WordDocument doc = new WordDocument();
byte[] wordBytes = …
using (var ms = new MemoryStream(wordBytes))
{
     doc.Open(ms, FormatType.Automatic);
}