How to convert a png file to texture file (*.dds)

[lolingos]

Hi fellas, I'm here to know how to convert a png file and make it work as a texture.
I tried with several applications (converters from png to dds) but every time I converted when I go to NBA 2KX Tool and import it, the program shows me a Java error:Java.io.FileNotFoundException
specifically, I 'm trying to edit gooeyoverlaystatic.iff file, I'm creating a Nba on tnt mod with watermark and wipe included, so anyone who can help me, could save me from hours lokking for solutions. Thanks in advance!

[JaoSming]

unfortunately the 2kx tool does not work with CF files. You need to use the 3DM Mod Tool
Tutorials on how to use it can be found in my signature