color name definitions in Bash on Ubuntu on Windows

Hello!
I struggle with the colors in VIM.
(in the Ubuntu Subsystem of Windows 10)
Because comment lines with syntax on was not readable for me.

I found the file rgb.txt in the folder /usr/share/vim/vim74
but most color names are not accepted by vim
e.g. :highlight Comment ctermfg=MidnightBlue

With numbers instead of names there a differences between 0 and 7
but the terminal emulation knows 16 colors.

Have you any tips?

Erhy

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