If this DTA format is really a special precompressor that is specialized mostly for WAV audio, I would appreciate it if someone could write a packer for it.
Have you tested it on the "aa.dta" file? If it is true, it contains OGG files, what kind of results would you get with or without OGGRE?
Found is a "DTAs Packer". (attached)
Russian descriptions from the tool:
https://lhm.fandom.com/ru/wiki/DTAs_packer
Exactly, it cannot be used for the "a0.dta" file. :/