My answer is somewhat inspired by @carmenPPlongoria pretty similar, as in analogy-wise, question here
And user @NateEldredge gave a pretty nice explaination, ultimately concluding
It would be like trying to play Call of Duty on your microwave oven.
Nate Eldredge @ bitcoin.stackexchange.com
The point is:- granted RPi, PS, Bitcoin Miners and Microwave Ovens are all powerful electronic devices but they are just not meant to do each others work.
One of the greatest issues the structural difference in chip|processor architecture, making emulation difficult. Also we can't simply port or share load between CPU & GPU if the code is optimized to run on either CPU or to exploit GPU.
Following should have been a comment, but I can't comment yet-
If you still haven't accepted defeat- I think (just wildly thinking) you can try to build wine on the *nix OS (this[bit.ly/1GBHGAH] guy did it) of your RPi & hope PCX2 will run. Let's not forget that ARM support is on wineHQ's aims list wiki.winehq.org/ARM
I saw similar & very noble motivation here[bit.ly/1x2SRCZ].