Notes about the HXD file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The HXD file type is primarily associated with 'Help 2' by Microsoft Corporation. MS Help 2.x was announced at WinWriters on March 5, 2001. MS Help 2 is the help system used by Visual Studio .NET help and MSDN Library, and now the Borland .NET IDEs.