WolfDec is work!(for latest) I just tried "arc_conv"、"DXExtract"、" DXArchive "、"GARbor"、"touhouSE" and not work.I searched for some time and found a few tools for this task:
You must be registered to see the links,You must be registered to see the linksandYou must be registered to see the links.
The first is very old, the second won't run for me, the third don't unpack unicode names and both second and third don't seem to support file masks. So I slightly modified DXADecode from the source.
Now it is possible to run DxaDecode.exe "*.wolf" to unpack all .wolf files with default key from 2.20 version of the Editor instead of typing DxaDecode.exe -K:8P@(rO!p;s5 FileName.wolf or DxaDecode.exe -K:C705CA7D8DE3DEF1D90C85F4 FileName.wolf for each file. Also there is option to guess decryption key from an archive if default is not working but encryption algorithm is the same. (In DXADecodeW.zip)
The source code included in the archive and can be built with g++ and make.
Edit: Since the time I originally wrote this post there were two additional tools that do this job nicely:
You must be registered to see the linksandYou must be registered to see the links(In WolfDec.zip).
Added compiled x64 WolfDec as attachment just in case. It can open latest .wolf files with DX signature in their header (needs Microsoft Visual C++ 2015 Redistributable installed).
now I can enjoy the BGM for learn.