Information here may innacurate since it's been a long time I worked on 
this game, and my notes were lost once my snesorama blog went offline. 

- compactar.exe -> dcz2wav.exe can unpack .dcz files, but wav2dcz.exe 
can't pack them back, it's a bug or something (both tools can be found 
somewhere else in this pack). I wrote this tool that take the list 
generated by dcz2wav.exe as input, and pack .dcz files back. Worked 
great. 

- pack.au3 -> Little tool to help me rename the output of 
"compactar.exe"? I'm not sure. 

- split_channels.exe -> Some of the audio inside DCZ is not uncompressed 
.wav, but a kind of ADPCM instead. You can unpack mono files with ffmpeg 
(I think you need to make some kind of trick in the header). For stereo 
files, you'll need to use this tool to split the channels before. After 
downsampling, audio can be re-encoded back using wavecon.exe. I never 
wrote a tool to join channels back because on my release I wanted to 
make mono files.