Hi Sebastian, One possible way to get things to work without modifying the core OSG would be to have a custom FindFileCallback and custom ReadFileCallback. The FindFileCallback would try the normal search for the file and on failure rather than passing back an empty string could pass back "FILE_NOT_FOUND:filename" and then the custom ReadFileCallback could filter fiter for "FILE_NOT_FOUND:" and then obtain the filename from the rest of the string.
Robert.
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