.HXC File Extension
File TypeMicrosoft Help 2 Collection Definition File
What is an HXC file?
File used by Microsoft Help 2.x help documents; defines the contents of a help collection and includes information such as the help project title, the help registration information, and pointers to the various help content files; used for building the .HXS help file.
NOTE: Microsoft Help 2.x projects can be edited with older versions of Visual Studio through version 2008.