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W32.Winux is not a platform-independent virus. W32.Winux's initial injection point must be a Windows machine -- it cannot start by infecting a Linux box. Once it infects a Windows computer though, it starts looking for certain files under the Windows file system and the Linux file systems. When it finds what it's looking for, it opens files and inserts code.
It initially infects a Windows system and seeks out certain Windows files (PE file types, which include .exe files). W32.Winux's uniqueness stems from the fact that it doesn't stop there. After infecting a Windows system, W32.Winux then starts looking through the system for any known Linux files -- for instance, through shared file systems or remote drives. It looks through those for Linux ELF files, which also include Linux system binaries.
Here's a link to learn a little more about it ...