Another thread showed this link for a DDS Converter program
and here is the readme file:
This submission is a graphics tool that generates DDS files (texture
format) in batch from a collection of popular file formats such as
BMP, PNG, PSD > and TGA. For this version, I selected nVidia's nvDXT
to produce them so the files produced by it are of the same quality
as they would be with > nVidia's DDS plugin for Photoshop.
The installation program will create shortcuts and add an entry into
the "Add/Remove programs" dialog box.
EDIT: this program is freeware
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