Nile error message

I am wondering if anyone can help me, i have just finished building my first map with nile, <<<-----(newbie). Problem is i saved it as a npz compression file and now i can't open it, i get an error message (can not parse project file). Is there anyway to fix this? I don't have the npj file, as i said newbie. Is this file lost for good or can someone save it.

It still runs in JO as a TKOTH but can't open it in Nile to edit a few bugs.

Tallywacker.

unsure but try this when you go to open the map in nile it show's the it show's map name .npz , below this is a set of drop down arrow's click the bottom 1 and click .npj . your map name should be there if not i'll try to hunt down your answer

Thanks Edward, i tried that but it still came up with the same error. I found npj file but still comes up the same.