I started a world in 14w06b, and I got tons of items in chests. THEN, I accidentally opened minecraft in 1.7.2 and when I entered the world I obviously lost everything. I tried opening it in the snapshot but it didn't work. So does anyone know how to recover it without creative or anything like that!?
Hi,
You cannot.
This was a bug in one of the snapshots, that has now been fixed.
Next time, use caution when using snapshots, their purpose is for development and may contain bugs and issues, naturally.