Here's what someone at Daz3D had to say:

The uvs installer available on the product page contains 2 uvs files. One of them is to put V2 UVs (where applicable) on the V3 mesh. The other one does the same thing, except it also includes material groups.

There are no files included to put V3 UVs onto the V1 or V2 mesh; the product page has been changed to reflect this.

Steps are as follows:
-Launch UVMapper
-Load RuntimeGeometriesDAZPeopleblMilWom_v3.obj
-Import UVs (of your choosing)
-Save the resultant obj (with only UV coordinates & material groups) to the same directory with a different name (like "blMilWom_v3-2uv.obj").

-Open RuntimelibrariescharacterDAZ PeopleVictoria 3.cr2 in your favorite text editor (EditPad works well with large ascii text files)
-Replace each occurrence of "figureResFile :Runtime:Geometries:DAZPeople:blMilWom_v3.obj" with "figureResFile :Runtime:Geometries:DAZPeople:" plus the name of the file you saved from UVMapper
-Save the cr2 with a new name (like "Victoria 3-2uv.cr2")

-Load in poser and apply a v2 map

*Teeth and gums use Millennium Teeth UV's (or V3), not V2.
*Pubic hair didn't exist in V2, so it keeps V3 UV's

I hope this helps to clarify the purpose of the files in question.

-Rob Whisenant
Content Production Coordinator
DAZ Productions, Inc.