CRI ROFS
ROFS is a bulk data file structure developed by CRI Middleware Co., Ltd. It is greatly built off of the ISO-9660 standard. These are easily identified as having the file name extension of CVM.
Random
Several official programs for handling CVM files are known to exist. Actual usage is not entirely known.
rofstoko.exe - ? Seemingly used to change existing data and perhaps conversion of some file types.
rofsedit.exe - ?
rofsgen.exe - ?
rofsbld.exe - ?
rofsview.exe - ?
There are a few homemade programs created for interacting with CVM filesystems with various limited functionality.
Apache3 - Badly named but effective for extracting the contents of a CVM (and several other disc image types such as GCM). It can also replace files inside the image. Has entirely no capacity to create new files from scratch.
apache3_setup.exe v3.10.6 beta
Daemon Tools (and some other disc mounting software) - If a 0x1800 block is removed from the start of the file, it can be mounted as a disc image. Other mounting utilities may not cooperate.
Abyss - A tiny custom tool made by darthi8nt for beating up the TO7BTL.cvm file from Tales Of The Abyss. It looks to be only for that specific file and no others.
VF4EXt_n_reb - Another tool from darthi8nt. Same deal as with Abyss, but for VF4STRMS.cvm on Virtua Fighter 4.