Problem solved.
It was easy at the end, but how could I know that before.
The font was already installed in all adobe products, but not in the first long font list from A-Z.
The font was unter the chinese fonts.
Thank you all for your generouse help.
Nice Weekend.
no i see the installed otf font in all adobe products, but if i try to change my thai text to this font, nothing happen, the font remains as tamoha.
and that’s the problem.
maybe i have to say, i work on pc.