HTML “download file” puzzle

Hi!
I use “download file” puzzle and I need to save particular dictionary as a text file into “media” subdirectory of the application root directory.
When I save it as “my-dict.txt”, it is properly exported, but into my user’s Download directory.
Whatever syntax I use, file always ends up in user’s Download directory. For example when I set “media/my-dict.txt”, exported file is “media_my-dict.txt” in user’s Download directory.

Thanks for any advice!