The GoG release has one plane-set and one theatre
As 1.28 did not use the "dir.set" system then the only way to allow it to have more theatres is via OAW.
I found the OAW128 source code and modified it slightly.
I made a working folder, and then added the GoG release stuff to it, allowing overwrites
The upshot is here:
I had put the GoG eaw.exe in an "E-" folder for selection, but others are available too
There are several "sets" available:
It is very easy to use, and I get good framerates with the GoG exe in d3d and Windows 10
Jel