No infact it was even.. enco...
Why do you think no one released it up until now? And why those who had it only gave it away under promises that it would not be shared and even sold them?
Well I didn't want to buy it so I made it myself...
I for one, do not want Valve figuring out how it was done, of course I am 99% certain they know how but that 1% will do for now. Just incase.
Try it yourself, run a virus scanner, it's nothing bad. (If you think it might be)
It acts exactly like the original file cept for one minor difference.
(The initial change was minimal.)