External Context Viewer
By default, Search and Replace uses an Internal Context Viewer to display the context of search hits when you double click on a hit line. As of v 4.6 the program can use the viewer/editor specified in Options|General ‘If no association use’ field (see External Editors).
Currently this feature can be activated via a manual registry change or the special configuration utility on our www site. Please write email@example.com for information.
If you want to make the setting manually, see the Special Registry Switches topic and scroll to ‘Disable Internal Context Viewer‘ section.