Quote Originally Posted by jlb2df
The download is compressed in Winrar.
The download is not compressed in winrar.

First, you need to turn off that damn "feature" in Windows that hides the extension for file types that it thinks it knows. I can't tell you the exact steps to do that since you didn't post what version of Windows you are using, but it should be an easy setting to find. It's completely useless and never does any good, only this type of harm.

Second, read the downloading faq, reached by following the documentation link near the top of this page. Just about everything in it will apply to helix too, except maybe the advice to use BitTorrent (I don't know of a Helix torrent but you seem to already have the ISO, you just need burning and maybe booting information).