File Type : XNA Game Studio XNA Framework Content Pipeline Binary File (Microsoft Corporation)
Compatible with (Win10, Win8, Win7, Vista and WinXP)
You'll need a new app to open this .XNB file
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Binary data file created with XNA Game Studio Express, an IDE designed for developing Windows and Xbox 360 games; contains one or more files in a single package.
The XNB format is considered an "intermediate format" since it packages original files into an proprietary file type. XNB files are referenced by games created with XNA Game Studio Express and are not meant to be opened manually.
An example game that uses XNB files is Terraria, a 2D action and adventure game. Terraria stores graphics, audio, and other game data using XNB files.
NOTE: While most XNB files cannot be opened directly, image files, such as .PNG images, may be extracted from an XNB file using a program like GXView (part of The GameTools Suite) or XNB Exporter.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.
Software that can be used to open XNBfiles: