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I want to put some parts of my document in Helvetica Neue UltraLight italic.

I use :

\fontspec{Helvetica Neue Ultralight} \selectfont   
\emph{...} ...

or :

\textit{...} ...

But none of 2 solutions seems to work, as the result is in Helvetica Neue LIGHT italic

I checked that the font I want exists on my computer, in a whole HelveticaNeue.dfont package.

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closed as too localized by lockstep, Werner, Kurt, Martin Schröder, Stephen Feb 15 '13 at 21:15

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You can specify the font by file name. That will always work. – Siyuan Ren Dec 6 '12 at 10:20
Which computer system are you on: Windows, MacOS X, or something else? – Mico Dec 7 '12 at 11:10