.XSX File Extension
File TypeVisual Studio XML Schema Layout File
What is an XSX file?
XML properties file used by Visual Studio, a Windows IDE developed by Microsoft; contains layout settings for an XML schema which is stored in an .XSD file; auto-generated by Visual Studio when designing schema layouts in the XML Schema Designer interface.
The XML Schema Designer component is included with Visual Studio 2005, but is not included with Visual Studio 2008 and later.