title: what is the uniform type identifier for docx file
body: <p>Read the document of <a href="https://developer.apple.com/library/mac/#documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html" rel="noreferrer"><em>Developer Library</em></a>, the identifier for <em>doc</em> is "<strong>com.microsoft.word.doc</strong>". But what is the identifier for <em>docx</em>??</p>