This is a recently added phrase in the interface, that is localized

restrict local file access (allow reading of SPT files)

I'd appreciate clarification in order to translate properly.
1. Does it mean
   a. local files may be accessed
   b. local files may not be accessed
2. And the 2nd part, is it a clarification or an exception to the first part?
  a. local files cannot be accessed but SPT files can
  b. local files may be accessed which means script files may be run

3. Is this applicable to signed or unsigned applet?

4. SPT does not mean that precise extension is needed, or does it? It will work the same wit any script files?  In this case, I would avoid using "SPT" since some users may not understand it. How about "allow reading of script files"?