Sorry I think I didn't make this clear but I want to save a .dds texture out of photoshop 64bit which does not appear to be supported by anyone's plugin.
You could either use the 32 Bit Version or try a Programm like Compressionator from ATI, but there is no way to get the Nvidia dds plugin working for photoshop 64 bit unfortunately
In response to the issue of 64-bit incompatibility, I wrote a simple javascript-based tool (really just a front end for Nvidia's Texture Tools 2 command-line functionality) for exporting DDS files from 64-bit versions of Photoshop. Although the tool works with 32-bit and 64-bit flavors of Photoshop, it's not as feature rich as Nvidia's plugin. As such, Nvidia's plugin probably makes more sense for 32-bit Photoshop installs. Please check out the tool, and let me know what you think. : )
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Make sure you change the image mode to 16-bit before running it
http://docs.kaneva.com/mediawiki/index.php/Photoshop_DDS_Exporter