Can a software like MPLAB take a .hex file and turn it back into assembly language?

 

you're looking for a disassembler
http://www.joescat.com/micro/picchip.htm
perhaps that will work, there are more out there

 

Why is a banana riding a llama giving a "rock" salute??

Is he riding the llama back from a Dio concert??

 

My initial thoughts were "Why is the llama green".