ok, I messed eith the files for a lot of times and it somehow worked...
First, the dsdecomp actually did detected a very few amount of file as lz-ovl compressed and decompressed them, but most of them didn't worked. It simply doesn't find any compressions so, you might want to double check the files or try to take them into consideration when impementing the plugins.
Those are the files that did worked:
https://www.dropbox.com/s/mk62hgmmctt2yq2/cgfx ripped.7z?dl=0
Basically, from the files I sent you earlier, if it's not one on this 7z, it means I wasn't able to get a decompressed output from dsdecomp version 5 alpha 2 (the release simply didn't work on those at all).
But I also send you this link for another reasons: those that did got decompressed successfully also somehow worked. If I open themin EFE, it can behave in 3 different patterns. Either it reads, but fail on opening complaining it didn't find the word "DICT" far in the file, either it reads and open, but outputs an error when it says that it sets a value of -255 for apha or either it simply reads and open properly.
The first case is just weird. I don't know if it's a bug but for your testing, I have listed 5 files that I tested and returned the DICT error:
btl_mag_00
EFF_ac_excellent_flash
pm_koopa
ROBJ_Battery_1
e_teresa_k
Again, you can have these files in the link I just sent.
The second case however is very rare. I can't export because of this, but I can view the textures and I just can't do anything on the model viewer. I only know the file bt_yos_05 did this.
As for the third case, it just works perfectly. Sure the model viewer might lags if the model viewer has a lot of data, but it views and export just fine (I even tested the files with blender, works).
Now, I do have one thing to say, is there any way to zoom in and out in the model viewer?
anyway, I wonder if you could check these problems because I only got a very few amount of files that I could rip. I know there's a python script somewhere if I want to batch proccess them, but I still can't get al cgfx I need so, might check this too. And of course, the alpha error as well as the read error....it might be bugs.
Still, I'm happy because some of the models I got were entire maps.
So, thanks anyway!