I have a Korean client who has a display issue using our software, and I'm having no success reproducing his issue on my PC, even after changing multiple settings to make my PC as Korean as possible.

Just wondering if the problem is that he bought his copy of Windows 10 in Korea and I did not.

Is it worth persevering with attempting to make my PC more 'Korean', and maybe does anyone have a definitive list of everything needed to change a Windows install to be exactly like a (in this case Korean) PC?

Or is it possible that there is simply some fundamental difference between my Windows and my client's, owing to the fact that he bought "Korean Windows"?

My guess and hope is that buying Windows 10 in Korea gives you just the same version as in any other country, just preconfigured for Korean, but it would be good to have this confirmed.

EDIT: Have now fixed this programmatically, please see my answer.