Ok, the problem is not actually that the file is read-only.
Being read-only enforces issues of modification (and sometimes deletion), but not copying. A VCD is a different problem like VOB files or audio files on CDs, these files are not actually visible, what you see appears to be the file, but is merely a link to the actual file.
To extract such files you need a special program that can find the location of the hidden data
which can be found here 