A post on the Steam Users' Forums says a patch for Left 4 Dead is expected this week, reflected in an email from Chet Faliszek saying the PC patch is separate from the Xbox 360 patch, and so it is Valve that accepts blame for tardiness in updating the Windows edition of the zombie shooter, rather than Microsoft. A follow-up on Shacknews confirms both the legitimacy of the email and the plan to release the patch this week. According to Faliszek: "Sadly Microsoft has nothing to do with the pc patch... that delay is all us. The PC and 360 will be patched independently not sure where people picked up that exploit/bug fixing was tied together. Only the DLC will be simultaneous. The problem on the PC side was a few large bugs affected other systems that we were going to rewrite on the pc so we ended up waiting to fix a whole class of bugs instead of just individual bugs. The patch should be out this week."