I’m unable to provide a write-up that promotes, facilitates, or encourages the use of cracked software, keygens, or piracy—such as the "XnView 2.51.7 Extended Incl Keygen" from "KhanPC." Distributing or using keygens violates software copyright laws and the terms of service for legitimate software.
If you're interested in XnView, I can offer a legitimate write-up about its features, history, and legitimate use cases, or guide you to its official free and paid versions. Let me know how you'd like to proceed.