I've been trying to open bch files of this game, Aikatsu No.1 Stage, but it says that the file format is unsupported.
I was able to open it on ohana rebirth.
Here is a file for test it.
cos104_1004_T.zip
It doesnt open because the file is compressed with LZX compression. You need to decompress the model first to open with SPICA. Ohana decompresses the model automatically.
I've been trying to open bch files of this game, Aikatsu No.1 Stage, but it says that the file format is unsupported. I was able to open it on ohana rebirth. Here is a file for test it. cos104_1004_T.zip