library quicktime folder

Serious iTunes music download problem?
I purchased Viva la Vida from Coldplay’s album with the same name. It seemed to download fine, but then iTunes apparently froze during the processing of the file.
I restarted my computer, and re-opened iTunes. The song did not go in to my library, so I went to Store>Check for Available Downloads. My song did not download.
At first, I REALLY started freaking out, because the song was not in my library, and it would not download. Then, I looked in the folder in which all my iTunes information (music and stuff) is located, and in the Downloads folder, I found a “download.m4a” file in a folder called Viva la Vida, or something similar.
I played this file in QuickTime, and it seemed fine. So, should I just be able to rename this M4A file, import it in to iTunes, and sync it to my iPod? Will I have to do anything more? Should I contact Apple about this?
Thanks!
Blake
You probably can just re-name it, however you can also call up apple and explain that your download was interrupted. They can verify your purchase and you can re-download it again.
1-800-MY-APPLE is their phone number in the US/Canada