There is only one file type that uses the .NEOSAVE extension:
Neopets Save File
Save file used by Neopets: Puzzle Adventure, a puzzle-solving adventure game; contains game data for individual Neopets that is automatically saved as the player progresses through the game; includes the Neopet's level, stats, and bonus points; also includes customized character information such as species, color, and name; not meant to be manually opened.
|Infinite Interactive Neopets: Puzzle Adventure||Paid|
Updated: March 26, 2014