Then click 'Open with' and choose an application. If you cannot open your XNB file correctly, try to right-click or long-press the file.
Without proper software you will receive a Windows message ' How do you want to open this file?' or ' Windows cannot open this file' or a similar Mac/iPhone/Android alert. You need a suitable software like XNA Game Studio from Microsoft Corporation to open an XNB file. XNB file making the execution quicker during game-play. Objects created using a DCC (Digital Content Creation) tool such as textures, sound files, sprites and fonts can be pre-compiled into an executable format during game build. One if the benefits the XNA Game Studio offers, is its content handling procedure and where we can find the XNB file.
Microsoft XNA Game Studio is a game development framework that allows Visual Studio to be used in developing games for Windows platforms including XBox 360 and Windows Phone.
XNB files mostly belong to XNA Game Studio by Microsoft Corporation.