Michael,
just for your information the font I need to use is this one:

http://www.adobe.com/type/browser/FB/TRAP/F_TRAP-10005000.html

Adobe, so maybe is the PS.... It's well recognize by windows, not by moi.

Thanks omac12! I will try today the conversion.

Hi, falcon76,
Just checking to see if you were able to find a resolution to your problem? If so, could I ask what solved it? I've a feeling I'd like to be prepared in case I wind up in the same boat.

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!

You're welcome. As I said before I had not tried them, so thank you for doing the testing for me. Now I know what works. :-)