I did a bit of testing across MacOS, Windows 7 and my Linux box (all running Sublime 3126) and discovered that this indeed seems to be the case.
On Windows/Linux the prompt_open
command does nothing at all, while on OSX it opens a file dialog. On the other hand, all three of them respond to prompt_open_file
by opening the file dialog.
I’m not seeing anything overtly different on MacOS using one command versus the other, but I can’t say what might be going on behind the scenes. The command list in the unofficial docs doesn’t seem to mention either version of the command.