Hi Marcel, can you explain this one a bit more?
Yes, not much info here, but there are some pointers on bug 6874.
We now use a general http header when downloading an uploaded file with tools/upload.pl: type=application/octet-stream. For PDF files we hardcoded application/pdf. This allows some browsers to show the file contents for e.g. a PDF file rightaway, etc. The idea for this bug was to make that configurable, i.e. add other headers where locally needed. From a preference or config file.
But it did not move since then ;)