.YSP File Extension
What is a YSP file?
Graphics file used by BYOB (Build Your Own Blocks), a variant of the creative programming application Scratch; contains a 2D image and animation settings; often used for program characters or game objects.
Scratch uses .SPRITE files for sprites. BYOB also uses the ".sprite" extension, although the primary sprite extension is ".ysp."
NOTE: BYOB is now developed under the name Snap!