Notes about the D2H 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 D2H file type is primarily associated with 'Diablo II Hack It'. Search Google for ".d2h hack" for sites relating to this file type. They seem to come and go at regular intervals.