Need help with this

[Acies]

Have you tried double-clicking it (the new file)?

Edit: On a more serious note this seems as logical as renaming an ".exe" to a ".jpeg" to, quote; "have a look at it".
Edit2: Actual help ---
I suggest you render/printscreen whatever model you have and then use the images to create the particle system. I also suggest you read up on particle systems before doing this, have a look at the wiki - it should be helpful.