Filetype after decompression

[lasnikr]

I am decompressing a sc2 file.
Confirming it with following command in bash:
head -n 1 icons_orig.sc | grep -q ^SC && strings icons_orig.sc | grep -q START && echo "sc2 file"
actually yields "sc2 file".

But running the file command on the now decompressed file gives following result:
icons.sc: SysEx File - IDP
What is that file format, how do I read / open it? I can't find anything useful online. I thought that it could maybe be used as a lookup table for the the corresponding *_tex.cv file to get the rotation and position of each element, but that's just a hopeful guess.