Am 18.10.2013 um 17:55 schrieb Sven Huynink <sven@huynink.nl>:

> I seem no to be able to use system fonts, not with /simplefonts neither with typescripts. When I define 
> 
> \starttypescript [serif] [arnoproregular]
> \definefontsynonym [Serif] [name:arnoproregular]
> \definefontsynonym [SerifItalic] [name:arnoproitalic]
> \definefontsynonym [SerifBoldItalic] [name:arnoproitaliccaption]
> \definefontsynonym [SerifCaps] [name:arnoproregular]
> \stoptypescript
> 
> (or any other system font in my Windows font directory e:/windows/ fonts as defined in osfontdir), I get        

You have to define also a typeface to use the typescript, e.g.

\starttypescript [serif] [arnoproregular]
  …
\stoptypescript

\definetypeface [myfont] [rm] [serif] [arnoproregular] [default]

\setupbodyfont[myfont]

\starttext
\input knuth
\stoptext

> fonts           > typescripts > unknown library 'loc'
> {E:/texprogs/texlive/2013/texmf-dist/fonts/map/dvips/lm/lm-math.map}{E:/texprogs/texlive/2013/texmf-dist/fonts/map/dvips/lm/lm-rm.map}{E:/texprogs/texlive/2013/texmf-dist/fonts/map/pdftex/context/mkiv-base.map}
> fonts           > 'fallback modern rm 11pt' is loaded
> 
> First, I don't understand "unknown library 'loc' " > I haven't defined that. Or does it mean 'local'? When I do the same with, say, garamond, I also get the line "unknown library 'garamond' " > why does it think garamond is in a library? 
> When I do 
> 
> mtxrun --script fonts --list --info --pattern=arnoproregular*
> 
> mtxfonts gives me all kinds of information, so the font *is* known to ConTeXt. Or is that a rash conclusion?       

Which information do you get?

> Second, there is not even a mention of the typescript or the font in the log. Why is that? Is it purely a syntax error in my setup as copied above?
> 
> Thirdly - of course - my question is: how can  I  make ConTeXt use my system fonts?       

On Windows and Mac you can use system fonts out of the box, you have to write only a typescript or use simplefonts.

> I use TexLive (most recent version), Texworks and Windows 7. Before I had a standalone ConTeXt set-up, which gave the same problems.

Can you try the following example with the current beta from the ConTeXt Suite.

\definefontfamily [mainface] [rm] [Arno Pro]

\setupbodyfont[mainface]

\starttext
\input knuth
\stoptext

Wolfgang