I don't know if you're intended to use a cache viewer or not, but it's not necessary (I didn't use one, I'm not sure there's even one for Mac). You can get what you need out of the file another way.
It might not be a bad idea to make it a little more obvious - I put some effort into it, and even dug through the blob by hand, but in 29KB of binary guck, I didn't notice anything that looked like what I was after...
Yeah I figured "open up a binary blob in a text editor and hope there are readable strings in there somewhere" proooooobably wasn't the "correct" solution to this, but since apparently no one's been able to do anything else useful with the file, I didn't want to rule it out
