A: Not necessarily. But you must verify the file hash against a known good copy. If unsure, delete it and use an alternative.
Why? Because the original developer stopped supporting Warkey around 2009. No official website exists anymore. Therefore, sketchy download aggregators host fake versions that contain: Warkey 7.1 Download
Since Warkey 7.1 is a community-developed tool, it is not hosted on official Blizzard platforms. You can find it on various software repositories and community forums. A: Not necessarily