I opened a file at random. This looks more like emulating the behavior in compilable C syntax rather than recovering the game's programming

void Em1eWeaponSet(cEm10* em) { Em10Work* w = EM10_WK(em);

    w->mot[41] = 0;
    w->mot[42] = 0;
    …
    w->mot[62] = 0;
    w->mot[63] = ARC(0x26C);
    w->mot[64] = ARC(0x26D);
    w->mot[65] = ARC(0x276);
    w->mot[66] = ARC(0x277);
    w->mot[67] = 0;
    w->mot[68] = 0;
    w->mot[69] = ARC(0x26A);
    w->mot[70] = ARC(0x26B);
    w->mot[71] = ARC(0x270);
    w->mot[72] = ARC(0x271);
    w->mot[73] = ARC(0x272);
    w->mot[74] = ARC(0x273);
    w->mot[75] = ARC(0x274);
    w->mot[76] = ARC(0x275);
    w->mot[77] = 0;
    w->mot[78] = 0;
}

There is more normal looking code in other files. It sounds like the original game had animation data (or similar) embedded in the C code.

Not a surprise. Now the fun works starts: Deriving semantics from psuedo-assembly.