Notes about the XHD 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 XHD file type is primarily associated with 'HappyFish' by ThirstyCrow. HappyFish is an RSS reader that can also download RSS enclosures (podcasts, mp3's, videos, pics, apps, whatever) to your computer. This file type is used to store or convey data realted to HappyFish functions (i.e., One-Click feed subscriptions from web pages).