I also found a website that provided an IPS file to decrypt the CC file. I'm not sure what that is. I looked it up, but all that came up were old utilities and a website that offers to apply a provided IPS file to a provided game data file. It looks like a modding thing.
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I had come across that ...

It won't work properly when run (there are likely more hardcoded values that need to be changed or the unpacked exe structure is just incompatible) but it's enough to load into debugger and get overlayed code fully visible.

IIRC I unpacked english executable with some dos-era unpacker called ...