I don’t know for you guys,but my avast! doesn’t detect this file as trojan (EICAR is detected as usual).
Not even when i try to launch it (i get 16-bit program error anyway). I also tested in Win98 emulation machine and i still get 16-bit error).
I saw on Jotti scanner that its detected as Win32:Trojan-Gen {Other}.
Strange…

EDIT: Upper download link is corrupted.
You need to go to CoreCodecs webpage and download it from there. Its a false positive,thats for sure.

I have also submitted report to Alwil about this FP directly via email.