What is a SFX?
They are simple XML files that the ps3 can read as SFO.

This is an example:


Code:
 <?xml version="1.0" encoding="utf-8" standalone="yes"?>
    <paramsfo add_hidden="false">
      <param key="ATTRIBUTE" fmt="int32" max_len="4">0</param>
      <param key="CATEGORY" fmt="utf8" max_len="4">IP</param>
      <param key="PARENTAL_LEVEL" fmt="int32" max_len="4">2</param>
      <param key="TITLE" fmt="utf8" max_len="128">Beat Sketcher™</param>
      <param key="TITLE_05" fmt="utf8" max_len="128">Beat Sketcher™ A mano libera</param>
    </paramsfo>

So I converted my SFO reader into a SFO to SFX converter.

You can get it here Dev Tools - PS3 Development Wiki
You can try to use my SFX with the tools for fake bluray.
I hope that someone will find it useful.
(for now, it only convert a sfo, doesn't matter where is it used, to a SFX. it can't convert (FOR NOW) a SFX to a SFO)

An example, from

Code:
[ SFO ]
[   1 ]         CATEGORY | Param: 2D
[   2 ]   PARENTAL_LEVEL | Param: 0x1
[   3 ]   PS3_SYSTEM_VER | Param: 01.3100
[   4 ]            TITLE | Param: PS2 System Data
[   5 ]         TITLE_ID | Param: NPIA00001
[   6 ]          VERSION | Param: 01.00

To

Code:
<?xml version="1" encoding="utf-8" standalone=yes"?>
<paramsfo add_hidden="false">
  <param key="CATEGORY" fmt="utf8" max_len="4">2D</param>
  <param key="PARENTAL_LEVEL" fmt="int32" max_len="4">1</param>
  <param key="PS3_SYSTEM_VER" fmt="utf8" max_len="8">01.3100</param>
  <param key="TITLE" fmt="utf8" max_len="128">PS2 System Data</param>
  <param key="TITLE_ID" fmt="utf8" max_len="16">NPIA00001</param>
  <param key="VERSION" fmt="utf8" max_len="8">01.00</param>
</paramsfo>

Download here