Dear omac12, sorry for the late reply, busy with some stuff.
Anyway, at the beginning I solve just with the text needed saved in .ai from Illustrator.
But after I need more control inside Moi. The tool discovery by Michael was too expensive for me (it's just a personal project, no money for this.....).
So I try your suggestion. No luck with the first link. I have download from the second one the freeware Type light 2.2 software (there are two professional version 2.2 and 3.0) and it make the conversion very well!
I just need to use the option: "Convert to TT curves" from "Global Ops" menu', because as already said by Michael the .otf contain some Postscript curves. Save as... in .tff and after the installation of the true type in Windows, the font was perfectly usable inside moi.

So thanks for your help!