Open the file? just put the downloaded file into the "terrains" folder and you are good to go. xD
If you have tried to open the file, then you might have corrupted that file, but you can download a new one of course
So you do not have to worry ^^
The file should be named: Spiritus.fhz
And please, do not use to many exclamation marks when posting, people (like me) take that offensive and i do not like it