JEDict is able to search EPWING dictionaries.
To make EPWING dictionary available for search in JEDict, copy the whole EPWING CD or create its alias inside ~/Library/JEDict/Dicts/epwing/ directory. Proper EPWING root directory should contain CATALOGS file.
EPWING dictionaries are loaded only at JEDict startup. They are not recognized during 'Install Dictionary' command execution.