Sorry, but I think the problem is with your system and not EDF as EDF works fine on 32-bit and 64-bit versions of Windows 7. I've been using it for years. To be sure they did not recently break it, I downloaded and ran the latest version 4.1.0.156 and tried it here on this 64-bit W7 system. It found a duplicate file I created, and it properly deleted it when I told it too.