.HXK File Extension
File TypeMicrosoft Help 2 Index File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an HXK file?
File used by Microsoft Help 2.x projects; specifies information about how a help index is organized; often used for keyword, context-sensitive, and other help indexes defined in the .HXS help documentation bundle.
NOTE: Older versions of Visual Studio, including 2005 and 2008, used Microsoft Help 2.x as the standard help format. However, Visual Studio 2010 and later no longer support Microsoft Help 2.x.