I looked into it in late 2003, and all assets I found was dlls and binary data files. There was also nothing about modding in your forums. I didnt care about ERT after that, so I take that you released the tools later.
The most important thing that I missed was something akin to a "sensors.cfg", where I could have adjusted the sub stealth to my liking.
I was also looking into the mission files, at the time I thought a dynamic mission generator would have benefited ERT immensely.
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