What is a xnb file and how do I open a xnb file?
XNB is a binary data file created with XNA Game Studio Express, containing one or more files. The XNB format is considered an intermediate format because 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.
Relevant xnb file links:How to open xnb file on Youtube
How to open xnb file on Wikipedia
How to open xnb file on Microsoft.com