I took a look at the .BIB file included with VGX builds, and there are a couple applets that might do what you're looking for. Applets intlp.cpl and intll.cpl are each included in VGX builds, but not at the same time. I don't know if these are the ones that handle regional settings.
Are you looking for an applet that was in one build, but not another? Or one that you've seen on another product? Details will help us hone in on how we can help.
To get a listing of the .CPL files in your build, search the .BIB file that came with it for ".CPL".