Obtaining file path in directory browser

[Rafael Laboissiere]

Is it possible to launch a shell command in the directory browser window
giving to it the file name (with its path) where the cursor is?
I am looking for something like:

    macro browser "X" "! ~/bin/command %f"

where %f would be a escape sequence replaced by the file name under the
cursor.

-- 
Rafael Laboissiere