File/Project Naming Error

Having trouble with LMMS? Ask about it here.
i was working on a song in LMMS, but i wanted to rename it. When i did i didnt add the (.mmpz) thing at the end of it. Now i cant load the song up! No matter how many times i click it, it never comes up. Can someone tell me how to get my song back? :oops:
.. .you open the folder
browse to your file
rightclicks it
choose rename from the context menu
enter the new name with extension .mmpz
press enter
open lmms, browse to the file, open it

that has btw nothing to do with lmms