Hey Costa,
In any Open or Save dialog you can hit ⌘⇧G to bring up a sheet to type or paste a path string into.
So your sequence would be something like:
- Type a Keystroke ⌘⇧G
- Pause Until a button named “Go” exists.
- Insert Text by Pasting your complete posix path string to the file.
- Press a Button “Go”.
- Pause Until a button named “Choose” is active.
- Press a Button “Choose”.
-Chris