[NTG-context] Where is bibmod searching for bibliography style files?

Hi, I created a custom bibliography style file (bibl-mybst.tex) and like to use it with \setuppublications[alternative=mystyle] For obvious reasons I want to move the file from texmf-context/tex/context/bib to some directory in texmf-local. Unfortunately, the file is not found in the texmf-local tree. I have tried several subdirectories using MkIV. Where should the file go so that bibmod finds it? Thanks, Florian