BeatCreator/BeatSlicer Grid File
From Just Solve the File Format Problem
A BeatCreator/BeatSlicer Grid File is a file used by the BeatCreator and BeatSlicer programs connected with FL Studio (FruityLoops), available as standalone programs or as part of the studio suite. They save the slice points within a particular sound loop so they can be sliced into separate channels. There is no actual audio data in this file, just indications of slice points that go along with an audio (WAV) file.