[XeTeX] ".ttf" automatically added to font names

[Dirk Hünniger]

Hi,

this works for me:

\setmainfont[Path=/usr/share/fonts/truetype/cmu/,UprightFont=cmunrm,BoldFont=cmunbx,ItalicFont=cmunti,BoldItalicFont=cmunbi]{cmunbx.ttf}

but this

\setmainfont[Path=/usr/share/fonts/truetype/cmu/,UprightFont=cmunrm.ttf,BoldFont=cmunbx,ItalicFont=cmunti,BoldItalicFont=cmunbi]{cmunbx.ttf}

causes the following error
>
> kpathsea:make_tex: Invalid fontname 
> `[/usr/share/fonts/truetype/cmu/cmunrm.ttf.ttf]/OT', contains '['
>
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !
> ! fontspec error: "font-not-found"
> !
> ! The font "cmunrm.ttf" cannot be found.
> !
> ! See the fontspec documentation for further information.
> !
> ! For immediate help type H <return>.
> !...............................................
>
> l.23 ...=cmunti,BoldItalicFont=cmunbi]{cmunbx.ttf}
So the only question remaining is: Will the xetex compiler developers 
keep it like this will a later version again require to write out the 
extensions like in

\setmainfont[Path=/usr/share/fonts/truetype/cmu/,UprightFont=cmunrm.ttf,BoldFont=cmunbx.ttf,ItalicFont=cmunti.ttf,BoldItalicFont=cmunbi.ttf]{cmunbx.ttf}

I just need to know so I can use the right form when generation latex 
code in my system.
Yours Dirk