I have to deal with such all the time.
SUGGESTION: Since they are using a PC, why not (and I’m sure this is water long under the bridge) suggest that they spend $69 on Premiere Elements to work with your raw files. Would save them quite a bit of money compared to your conversion efforts. And (I so hate to say this as it will be evidence that I have used WMM) Premiere Elements and WMM are quite similar.
james =)