The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  2  1  1
 0  2  0  0  2  2 2a 2a^2 2a^2+2a 2a^2+2a+2 2a^2+2a+2  2 2a^2+2a+2  0 2a 2a^2+2a  0 2a+2 2a^2+2a 2a^2+2a+2 2a 2a 2a 2a^2+2a  2  2 2a+2  2 2a^2+2  2  2  0
 0  0  2  0 2a^2+2 2a^2+2a+2 2a 2a^2+2 2a^2+2 2a 2a^2+2 2a^2 2a 2a^2+2a+2 2a 2a  2  0 2a^2+2a+2 2a^2 2a^2+2a 2a^2+2 2a^2+2a+2 2a^2+2a 2a+2  0 2a+2 2a^2+2  0 2a^2 2a^2+2 2a^2
 0  0  0  2  2 2a^2+2a 2a^2+2a  2 2a^2+2 2a^2+2a 2a^2+2 2a^2+2 2a+2  2  2  0 2a^2+2a 2a^2+2 2a 2a^2  0 2a+2 2a+2  0 2a+2 2a^2+2a 2a^2+2 2a^2+2a+2 2a 2a 2a+2  2

generates a code of length 32 over GR(64,4) who´s minimum homogenous weight is 200.

Homogenous weight enumerator: w(x)=1x^0+287x^200+763x^208+448x^210+714x^216+6272x^218+693x^224+21952x^226+623x^232+609x^240+336x^248+70x^256

The gray image is a code over GF(8) with n=256, k=5 and d=200.
This code was found by Heurico 1.16 in 0.296 seconds.