Here is a test and the attached output and also the path of where the 
fonts are placed in file font.dir and the output from mtxrun --script 
fonts list museo* in fonts.list


Janneman
>
> Can you test what happens with a minimal file:
>
> \definefont[testfont][name:museo700]
>
> \starttext
> \testfont \input knuth
> \stoptext
>
>> Is there some changes neccessary in those files?
>
> No. type-exljbris works fine here.
>
> The only other thing that I can think of is probably something wrong 
> with the PATH. Try running
>
> mtxrun --script context 74.tex (rather than context 74.tex)
>
> Aditya
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