You're quite tight, Simon.
Computers should never be relied on but in the cases I mentioned we use tried and reliable software and keep it simple.
Also, when the files are used mainly from a CD-ROM they are not likely to get corrupted easily.
Maybe I should also mention that I am not one to advocate the use of computers... I have been messing around with computers since 1978 so I have had it up to the wisdom teeth I don't have anymore with computers...
Computers are excellent tools but, like all tools, they have their limitations.