Am Sonntag, den 18.12.2011, 16:05 +0100 schrieb <o.gruber(a)nit.at&gt;: Good! :) I would look for: gui_launch_url(const char *url) ( However, I newe saw that this one get's called for my frontend. ) and: gui_download_window_create() gui_download_window_data() gui_download_window_error() gui_download_window_done() These functions handle a "download window" - it's not implemented within framebuffer, but you could implement a pure virtual download window, handling execution of external app within the gui_download_* functions. However, I believe the correct way would be to get netsurf to call gui_launch_url for unknown file types and then you probably can handle your stuff there. Greets, m