Thanks for the reply dai
I tried the liutilties site before posting here - but without any success.
To be honest, the article in the PDF doesn't mean a lot to me - as far as I can make out from googling, these RVG files are used by kodak in their latest digital dental x-ray systems.
Most of the websites that come up when googling recommend cleaning up registry data and updating drivers, and they offer a free scan which then leads to purchase of the actual reg cleaner and driver update software.
I was hoping to find a file converter that would translate the files into jpeg, or at least something that is functional within xp, but I have been unable to find anything that helps.
None of the processing applications I have on my PC will recognise the format.
If you have any other thoughts, I'd be interested to hear them.