Thank you Michael,
For the record here is the solutions I found to use this kind of font in MOI3D.

1. For fancy shape, resembling existing fonts (filled area style font), I use Offset to reduces the font to a skeleton with very acceptable result.

2. For simple stick font, install a free program called DeskEngrave by http://www.deskam.com/deskengrave.html
At installation the font Stick40.ttf is added to \Windows\Fonts and therefore usable in MOI3D.

Gaston