Extracting CVM/ROFS?

[Lei_WuLong]

Hi,

I am looking for a way/tool to extract the contents of an CVM (ROFS) file, which seems to be a container file used in some games (in my case: Kunoichi/Nightshade).
After searching the internet, I found that apparently some iso tools like UltraISO/Apache3/MagicISO are able to open an CVM file. But... no luck here. Any ideas?

background:
I have this (futile?) idea of creating an "undub" (replace english voices with original japanese, but keep the english subtitels) for the game. Why? Because it's interesting from a technical standpoint and because I like the original voices better. The basic procedure should be simple: extract both versions of the game, replace the audio files (maybe demux/remux some videos), put it back together.
It's comparatively easy finding tools to convert given audio files. Opening CVMs should also be possible, as (for example) Persona 3 also uses them and someone created an undub for it.

[vsub]

This is your first stop but you need to register there first to see what this link is.
Xpert with the CVM plugin.

[Lei_WuLong]

Thanks.
I get the an error: "invalid file header or file encrypted". I guess in this case I have an encrypted file, which means this is the end of the road for me.

Looks like I picked the wrong game for this.