R426,
Did you try removing the extension from the file name? Anyone who downloads iit wiould just have to add the extension.
For some files, this does work. Others, with an unusual structure (compiled or strange characters) might not make it if the system reads the files. My work system won't let a .exe files through with or without the extension.
Though I don't get up to that part of the world all that often, when I do, having I would like to have the systems where I can load them myself.