Ctrl-Alt-F: File To URI
Toggles the word at the cursor from a filename to a file:/// URI, or vice versa.
This hotkey attempts to change the space-delimited word at the cursor. It knows nothing about function arguments, commas, or other argument separators. If you want to use it on a filename inside a function, you must supply spaces around the filename.
Ctrl-Alt-F is the default hotkey for this action, but you can change it with
EDITKEYS /K19:
key.