The thread I started, linked by rwols, wasnât really about the lack of a file selector dialog in the API. However with that said it would be a helpful addition to the API.
I donât think it should be called prompt_open_file(), it would be better to make it more generic, e.g. file_selector_dialog(). There is no need for an on_done callback, better would be for it to block until a file is selected or it is cancelled, then it could return the full path or an empty string on cancellation. The window the method is called from is not needed, active_window() can provide that. Finally since it is a generic file selector dialog the caption must be settable.
file_selector_dialog(caption, <optional_start_folder>)

. Anyway, itâs platform dependent is my point. So Sublime should make this issue platform-independent by providing a 

