Convert xnb to cur

Download and install the latest version of Filestar.
Right click on one or more Xnb file(s) on your desktop and select Convert with Filestar.
Type convert to cur in the search box.
Press Convert.

What is the difference between .xnb and .cur?

Name: XNA Game Studio Texture; Windows Cursor
Extension: .xnb; .cur
Format: Binary; Binary
Category: Raster Image; Developer
Developer: Microsoft
Description: A CUR file is a cursor image or animation used for the Windows mouse pointer. It may be an arrow (for general use), a spinning hourglass (for waiting periods), or an I-bar (for text editing).
MIME Type: image/x-xna-texture; application/octet-stream
Sample: sample.cur
Wikipedia: .cur on Wikipedia