PS3HaX Developer DeViL303 has updated XMB File Manager(XMBFM), he has two versions and they are both included in the download.

D = Works on Debug Rebug Menu
R = Works on 3.55 OFW/Kmeaw and Retail Rebug Menu

Here is a quote from the thread:

I have updated the release to XMBFM Beta v0.03D and XMBFM Beta v0.03R (with D suffix for 3.55 Debug XMBs and R suffix for 3.55 Retail XMBs)

Gonna Change the suffix next time a its confussing because “R” could be for Rebug but it not, it should work on any 3.55 retail xmb, 3.55 kmeaw , 3.55 Official FW, rebug 3.55 retail xmb(in rebug mode) etc.

Download XMBFM Beta v0.03D and XMBFM Beta v0.03R

If you want to give a helping hand, you can also participate in this thread if you wish to:
Technical thread with Code Relating to XMB xml/rco hacks and XMBFM etc