Just Dance: Vitality School (PC)

[vladik4kides]

I need to decompress .z file to get a json from it, but I can't do it in regular way (using 7Zip, WinRAR, GZip and other tools, they just don't work). Also there is settings.json file which stores all of the hash values for .z files, but I don't know if it will help. So I ask if someone from there could write a script to decompress this weird file.
Link to .z files
link

[vladik4kides]

Anyone?

[aluigi]

These files starting with 2J or 2I have been already seen on this forum:
http://zenhax.com/viewtopic.php?f=9&t=3138
No solution.