I am developing Thumbnail Extension. To prepare a graphic (in .dylib) for file specified in URL.path I need to access second file, which has the same filename, but different extension. For example, I have "data" in file.*** and "colors" in file.yyy. Is it possible to read data from this second file while processing the first file in my extension? In my current implementation it sometimes works, but most of the time it doesn't work - it is not possible to read data from file.yyy when preparing thumbnail for file.***, causing exception in my .dylib routine. Is there some setting which would allow me to do this?