HELP: Images in Library/Caches/Desktop

I REALLY have to recover an image which I believe is now in the folder Library/Caches/Desktop/ and has ".dpCache" as extension (and don't know how it got there since it was regularly on my desktop and disappeared from anywhere else in the computer). I read a post in the forum dated two years ago, where somebody said it's impossible to recover such files. But this photo is very important for my job. I was wandering if somebody out there knows of any new way, developed in these last two years, of opening up and saving these items. If you do, please be "simple", I'm not an expert!
THANK YOU!
Viva
(if i'm in the wrong section of the forum
please redirect me...thanks again!)