Vim: How to handle Unicode files with text in multiple (more than two) languages?

Using gVim on Windows, I did the following two things:

:set encoding=utf-8
:set guifont=*

The second command brings up a font picker. By choosing the font "@MS Mincho", I got some of the Japanese characters to display, but oddly they were rotated 90 degrees to the left.

Anyway, you'll have to set the encoding before loading or pasting text into gVim (otherwise it might just convert them to all question marks). Then you'll have to find a font that is (a) fixed width, and (b) includes the characters you want to see. I don't seem to have such a font on my system at the moment, but you may.