Editing caw object

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Hello everyone,

Another question : I noticed that there is in the pac/edit repertory all the object that we can use for the caw.

I can with decompress it with XPACK to get a .yobj. But with X-REY, I can't open it (invalid file) to make a .obj that is usable on Blender.

My questions are :

1) Is it possible to change the shape of some caw object ?

2) If it's possible, how to do that ? How to transform these .yobj who don't work with X rey ?

Thanks !