Possible AppleScript solution
[link|http://www.macwindows.com/convertr.html|AppleScript for Converting File Names]
Thomas C. Garc\ufffda, vice-president of ICON ( an Apple Reseller in the Caribbean and South Florida) has sent us an AppleScript that reads the type and creator codes of Mac files and adds the equivelent PC extension.
I'm not sure how compatible AppleScript is between OS 8.5 and OS X.
Darrell Spice, Jr. [link|http://spiceware.org/gallery/ArtisticOverpass|Artistic Overpass]\n[link|http://www.spiceware.org/|SpiceWare] - We don't do Windows, it's too much of a chore