.BLOCKPLT File Extension
File TypeLEGO MINDSTORMS NXT Block Palette File
What is a BLOCKPLT file?
Application support file used by LEGO MINDSTORMS NXT Software, which provides an interface for programming LEGO MINDSTORMS robots; stores a block palette, which provides programmable blocks that can be inserted into the program of a robot.
NOTE: LEGO MINDSTORMS NXT "evolved" into LEGO MINDSTORMS EV3 in 2013.