The prompt "File: Supercow.zip ... — come up with a post" likely refers to a few different things, depending on whether you're talking about a game, a development project, or a technical issue. Here are the most likely interpretations:

You might be looking for a social media or forum post about the 2007 platformer game SuperCow (sometimes called a "Post-Soviet Masterpiece").

And its very expensive, around 100 euro. system March 20, 2010, 8:15pm 4. Hi SuperCow, It´s very interesting your project... cool! Arduino Forum

Could you clarify if you are looking for a for the game, a technical announcement for a developer project, or help with a programming "POST" request ? I have ported at90can128 to arduino - Exhibition

You might be trying to "POST" (upload) a file named Supercow.zip to a server or web service and are looking for the correct code snippet or troubleshooting steps .

There is a well-known user or project named "SuperCow" in the Arduino community related to porting AT90CAN128 to Arduino; you might need a post announcing a code update or a bug fix for a .zip library.