Can *.avi or other media file contain any dangerous script or code?
I saw following message in Microsoft Security Essentials:
Category: Trojan Downloader
Description: This program is dangerous and downloads other programs.
Recommendation: Remove this software immediately.
Items:
containerfile:C:\Users\...\amediafilename.avi
file:C:\Users\...\amediafilename.avi->(ASF_Script_Commands)
These dangerous files (in general, any file can pose a treat) exploit a bug in a certain program or driver, usually via a buffer overflow. If your program uses that driver/helper/whatever, it can possibly lead to the virus being downloaded by proxy, even if your program is bug-free.